diff --git a/modules/development.nix b/modules/development.nix
new file mode 100644
index 0000000..6b5025e
--- /dev/null
+++ b/modules/development.nix
@@ -0,0 +1,475 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}:
+
+let
+  inherit (lib) mkIf;
+  cfg = config.omni;
+  omni = config.omni.lib;
+in
+{
+  config = mkIf (config.omni.packs.development.enable or false) {
+    # Development tools
+    environment.systemPackages = with pkgs; [
+      # Version control
+      git
+      git-lfs
+      lazygit
+      gh
+      gitlab
+      hub
+
+      # Editors and IDEs
+      # neovim (configured via home-manager programs.neovim)
+      claude-code
+      opencode
+      pi-coding-agent
+      vscode
+      vim
+      emacs
+
+      # Language servers and tools
+      # Nix
+      nil
+      nixfmt
+      statix
+      deadnix
+      nixd
+      alejandra
+
+      # Rust
+      rustc
+      cargo
+      rustfmt
+      rust-analyzer
+      clippy
+      cargo-watch
+      cargo-edit
+      cargo-audit
+      bacon
+
+      # Go
+      go
+      gopls
+      gotools
+      go-tools
+      golangci-lint
+      delve
+      gomodifytags
+      gotests
+      impl
+
+      # Python
+      python3
+      python3Packages.pip
+      python3Packages.virtualenv
+      python3Packages.black
+      python3Packages.pylint
+      python3Packages.pytest
+      python3Packages.ipython
+      pyright
+      ruff
+
+      # Node.js
+      nodejs
+      pnpm
+      yarn
+      typescript
+      typescript-language-server
+      eslint
+      prettier
+      nodemon
+      deno
+      bun
+
+      # C/C++
+      gcc
+      clang
+      cmake
+      gnumake
+      gdb
+      lldb
+      clang-tools
+      ccls
+      bear
+      valgrind
+
+      # Java
+      jdk
+      maven
+      gradle
+      jdt-language-server
+
+      # Julia
+      julia-bin
+
+      # Database tools
+      postgresql
+      mysql84
+      sqlite
+      redis
+      mongodb
+      dbeaver-bin
+
+      # Container tools
+      docker
+      docker-compose
+      podman
+      buildah
+      skopeo
+      dive
+      lazydocker
+
+      # Kubernetes tools
+      kubectl
+      kubernetes-helm
+      k9s
+      kind
+      minikube
+      kustomize
+      kubectx
+      stern
+      kubecolor
+
+      # Cloud tools
+      awscli2
+      google-cloud-sdk
+      azure-cli
+      terraform
+      terragrunt
+      ansible
+      vagrant
+      packer
+
+      # API development
+      httpie
+      curl
+      postman
+      insomnia
+      grpcurl
+      evans
+
+      # Build tools
+      bazel
+      meson
+      ninja
+      scons
+
+      # Documentation tools
+      mdbook
+      hugo
+      mkdocs
+      sphinx
+
+      # Performance tools
+      hyperfine
+      flamegraph
+      perf-tools
+      heaptrack
+
+      # Network tools
+      wireshark
+      tcpdump
+      nmap
+      netcat
+      socat
+      mtr
+
+      # Misc development utilities
+      jq
+      yq-go
+      fx
+      direnv
+      watchexec
+      entr
+      tmux
+      tmuxinator
+      asciinema
+      tokei
+      cloc
+      tree-sitter
+
+      # Custom development scripts
+      (writeShellScriptBin "dev-postgres" ''
+        #!/usr/bin/env bash
+        echo "Starting PostgreSQL development container..."
+        docker run --rm -d \
+          --name dev-postgres \
+          -e POSTGRES_PASSWORD=postgres \
+          -p 5432:5432 \
+          postgres:15-alpine
+        echo "PostgreSQL running on localhost:5432"
+        echo "Username: postgres, Password: postgres"
+        echo "Stop with: docker stop dev-postgres"
+      '')
+
+      (writeShellScriptBin "dev-redis" ''
+        #!/usr/bin/env bash
+        echo "Starting Redis development container..."
+        docker run --rm -d \
+          --name dev-redis \
+          -p 6379:6379 \
+          redis:alpine
+        echo "Redis running on localhost:6379"
+        echo "Stop with: docker stop dev-redis"
+      '')
+
+      (writeShellScriptBin "dev-mysql" ''
+        #!/usr/bin/env bash
+        echo "Starting MySQL development container..."
+        docker run --rm -d \
+          --name dev-mysql \
+          -e MYSQL_ROOT_PASSWORD=mysql \
+          -p 3306:3306 \
+          mysql:8
+        echo "MySQL running on localhost:3306"
+        echo "Username: root, Password: mysql"
+        echo "Stop with: docker stop dev-mysql"
+      '')
+
+      (writeShellScriptBin "dev-mongodb" ''
+        #!/usr/bin/env bash
+        echo "Starting MongoDB development container..."
+        docker run --rm -d \
+          --name dev-mongodb \
+          -p 27017:27017 \
+          mongo:latest
+        echo "MongoDB running on localhost:27017"
+        echo "Stop with: docker stop dev-mongodb"
+      '')
+
+      (writeShellScriptBin "dev-env" ''
+        #!/usr/bin/env bash
+        # Create a development shell for a specific language
+
+        case "$1" in
+          rust)
+            nix-shell -p rustc cargo rustfmt rust-analyzer clippy
+            ;;
+          go)
+            nix-shell -p go gopls gotools
+            ;;
+          python)
+            nix-shell -p python3 python3Packages.pip python3Packages.virtualenv
+            ;;
+          node)
+            nix-shell -p nodejs pnpm
+            ;;
+          c|cpp)
+            nix-shell -p gcc cmake gnumake gdb
+            ;;
+          julia)
+            nix-shell -p julia-bin
+            ;;
+          *)
+            echo "Usage: dev-env <language>"
+            echo "Supported languages: rust, go, python, node, c, cpp, julia"
+            exit 1
+            ;;
+        esac
+      '')
+
+      (writeShellScriptBin "dev-project" ''
+        #!/usr/bin/env bash
+        # Initialize a new development project
+
+        PROJECT_NAME="$1"
+        PROJECT_TYPE="$2"
+
+        if [ -z "$PROJECT_NAME" ] || [ -z "$PROJECT_TYPE" ]; then
+          echo "Usage: dev-project <name> <type>"
+          echo "Types: rust, go, python, node, nix"
+          exit 1
+        fi
+
+        mkdir -p "$PROJECT_NAME"
+        cd "$PROJECT_NAME"
+
+        case "$PROJECT_TYPE" in
+          rust)
+            cargo init
+            echo "use flake" > .envrc
+            cat > flake.nix << 'EOF'
+        {
+          description = "Rust development environment";
+          inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+          outputs = { self, nixpkgs }:
+            let pkgs = nixpkgs.legacyPackages.x86_64-linux;
+            in {
+              devShells.x86_64-linux.default = pkgs.mkShell {
+                packages = with pkgs; [ rustc cargo rustfmt rust-analyzer clippy ];
+              };
+            };
+        }
+        EOF
+            ;;
+
+          go)
+            go mod init "$PROJECT_NAME"
+            echo "use flake" > .envrc
+            cat > flake.nix << 'EOF'
+        {
+          description = "Go development environment";
+          inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+          outputs = { self, nixpkgs }:
+            let pkgs = nixpkgs.legacyPackages.x86_64-linux;
+            in {
+              devShells.x86_64-linux.default = pkgs.mkShell {
+                packages = with pkgs; [ go gopls gotools ];
+              };
+            };
+        }
+        EOF
+            ;;
+
+          python)
+            echo "use flake" > .envrc
+            cat > flake.nix << 'EOF'
+        {
+          description = "Python development environment";
+          inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+          outputs = { self, nixpkgs }:
+            let pkgs = nixpkgs.legacyPackages.x86_64-linux;
+            in {
+              devShells.x86_64-linux.default = pkgs.mkShell {
+                packages = with pkgs; [
+                  python3 python3Packages.pip python3Packages.virtualenv
+                ];
+                shellHook = "python -m venv .venv && source .venv/bin/activate";
+              };
+            };
+        }
+        EOF
+            ;;
+
+          node)
+            npm init -y
+            echo "use flake" > .envrc
+            cat > flake.nix << 'EOF'
+        {
+          description = "Node.js development environment";
+          inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+          outputs = { self, nixpkgs }:
+            let pkgs = nixpkgs.legacyPackages.x86_64-linux;
+            in {
+              devShells.x86_64-linux.default = pkgs.mkShell {
+                packages = with pkgs; [ nodejs pnpm ];
+              };
+            };
+        }
+        EOF
+            ;;
+
+          nix)
+            echo "use flake" > .envrc
+            cat > flake.nix << 'EOF'
+        {
+          description = "Nix development environment";
+          inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+          outputs = { self, nixpkgs }:
+            let pkgs = nixpkgs.legacyPackages.x86_64-linux;
+            in {
+              packages.x86_64-linux.default = pkgs.hello;
+              devShells.x86_64-linux.default = pkgs.mkShell {
+                packages = with pkgs; [ nixfmt nil ];
+              };
+            };
+        }
+        EOF
+            ;;
+
+          *)
+            echo "Unknown project type: $PROJECT_TYPE"
+            exit 1
+            ;;
+        esac
+
+        git init
+        direnv allow
+
+        echo "Project '$PROJECT_NAME' created with $PROJECT_TYPE template"
+        echo "Run 'direnv allow' to activate the development environment"
+      '')
+    ];
+
+    # Development services
+    services = {
+      # PostgreSQL
+      postgresql = {
+        enable = false; # Set to true to enable
+        package = pkgs.postgresql_15;
+        dataDir = "/var/lib/postgresql/15";
+        authentication = ''
+          local all all trust
+          host all all 127.0.0.1/32 trust
+          host all all ::1/128 trust
+        '';
+      };
+
+      # Redis
+      redis.servers."" = {
+        enable = false; # Set to true to enable
+        port = 6379;
+        bind = "127.0.0.1";
+      };
+
+      # MySQL/MariaDB
+      mysql = {
+        enable = false; # Set to true to enable
+        package = pkgs.mariadb;
+        settings = {
+          mysqld = {
+            bind-address = "127.0.0.1";
+            port = 3306;
+          };
+        };
+      };
+    };
+
+    # VSCode settings
+    environment.variables = {
+      # Enable VSCode to use Wayland
+      NIXOS_OZONE_WL = "1";
+    };
+
+    # Development shell environments
+    programs.direnv = {
+      enable = true;
+      nix-direnv.enable = true;
+    };
+
+    # Git configuration
+    programs.git = {
+      enable = true;
+      lfs.enable = true;
+      config = {
+        init.defaultBranch = "main";
+        core = {
+          editor = "nvim";
+          autocrlf = "input";
+        };
+        pull.rebase = false;
+        push.autoSetupRemote = true;
+      };
+    };
+
+    # Enable lorri for automatic nix-shell
+    services.lorri.enable = true;
+
+    # nix-ld: lets unpatched binaries (Julia native deps like Makie/CUDA/MKL,
+    # vendor SDKs, etc.) dlopen shared libraries at runtime. Libraries listed
+    # here become available via $NIX_LD_LIBRARY_PATH.
+    programs.nix-ld = {
+      enable = true;
+      libraries = with pkgs; [
+        libGL
+        libglvnd
+        libx11
+      ];
+    };
+
+  };
+}
diff --git a/modules/packages.nix b/modules/packages.nix
new file mode 100644
index 0000000..57c4eab
--- /dev/null
+++ b/modules/packages.nix
@@ -0,0 +1,202 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}:
+
+let
+  inherit (lib)
+    mkEnableOption
+    mkOption
+    mkIf
+    types
+    optionals
+    ;
+  cfg = config.omni;
+  omni = config.omni.lib;
+in
+{
+  options.omni.packages = {
+    enable = mkEnableOption "Omnixient packages";
+
+    exclude = mkOption {
+      type = types.listOf types.str;
+      default = [ ];
+      example = [
+        "discord"
+        "spotify"
+        "steam"
+      ];
+      description = "List of package names to exclude from installation";
+    };
+
+    categories = {
+      base = mkEnableOption "Base system packages" // {
+        default = true;
+      };
+    };
+  };
+
+  config = mkIf (cfg.enable or true) {
+    # Wire package categories to feature flags via mkDefault (overridable)
+    omni.packages.categories = {
+    };
+
+    environment.systemPackages =
+      with pkgs;
+      omni.filterPackages (
+        # Base system packages (always installed)
+        [
+          # Core utilities
+          coreutils
+          util-linux
+          binutils
+          pciutils
+          usbutils
+          lshw
+
+          # File management
+          file
+          tree
+          ncdu
+          duf
+          dust
+
+          # Networking
+          iproute2
+          iputils
+          dnsutils
+          nettools
+          nmap
+          wget
+          curl
+          aria2
+
+          # Archives
+          zip
+          unzip
+          p7zip
+          rar
+          unrar
+          xz
+
+          # System monitoring
+          btop
+          htop
+          iotop
+          iftop
+          nethogs
+          lsof
+          sysstat
+
+          # Text processing
+          vim
+          gnused
+          gawk
+          jq
+          yq-go
+          ripgrep
+          fd
+          bat
+          eza
+          fzf
+          zoxide
+
+          # Version control
+          git
+          git-lfs
+          lazygit
+          gh
+
+          # Terminal multiplexers
+          tmux
+          screen
+
+          # System tools
+          rsync
+          rclone
+          age
+          sops
+          gnupg
+          pass
+          pwgen
+
+          # Shell and prompts
+          bash
+          zsh
+          fish
+          starship
+          oh-my-posh
+
+          # Package management helpers
+          nix-index
+          nix-tree
+          nix-diff
+          nixfmt
+          nil
+          statix
+          deadnix
+          cachix
+          lorri
+          direnv
+        ]
+      ); # End of filterPackages
+
+    # Font packages
+    fonts.packages = with pkgs; [
+      # Nerd fonts (for icons in terminal)
+      nerd-fonts.jetbrains-mono
+      nerd-fonts.fira-code
+      nerd-fonts.hack
+      nerd-fonts.iosevka
+      nerd-fonts.meslo-lg
+      nerd-fonts.sauce-code-pro
+      nerd-fonts.ubuntu-mono
+      nerd-fonts.droid-sans-mono
+      nerd-fonts.roboto-mono
+      nerd-fonts.inconsolata
+
+      # System fonts
+      noto-fonts
+      noto-fonts-cjk-sans
+      noto-fonts-color-emoji
+      liberation_ttf
+      ubuntu-classic
+      roboto
+      open-sans
+      lato
+
+      # Programming fonts
+      jetbrains-mono
+      fira-code
+      hasklig
+      victor-mono
+
+      # Icon fonts
+      font-awesome
+      material-icons
+      material-design-icons
+    ];
+
+    # Enable font configuration
+    fonts.fontconfig = {
+      enable = true;
+      defaultFonts = {
+        serif = [
+          "Noto Serif"
+          "Liberation Serif"
+        ];
+        sansSerif = [
+          "Noto Sans"
+          "Liberation Sans"
+        ];
+        monospace = [
+          "JetBrainsMono Nerd Font"
+          "Noto Sans Mono"
+        ];
+        emoji = [ "Noto Color Emoji" ];
+      };
+    };
+  };
+}