diff --git a/config.py b/config.py
new file mode 100644
index 0000000..abc85ad
--- /dev/null
+++ b/config.py
@@ -0,0 +1,43 @@
+import json
+import logging
+from pathlib import Path
+from typing import Any
+
+from constants import USER_CONFIG_FILE, USER_TOOLS_DIR, DEFAULT_CONFIG
+
+logger = logging.getLogger(__name__)
+
+
+def load() -> dict[str, Any]:
+    """Load config from disk, merging with defaults for any missing keys."""
+    if USER_CONFIG_FILE.exists():
+        try:
+            on_disk = json.loads(USER_CONFIG_FILE.read_text())
+            return {**DEFAULT_CONFIG, **on_disk}
+        except (json.JSONDecodeError, OSError) as exc:
+            logger.warning("Config file unreadable (%s), using defaults.", exc)
+    return dict(DEFAULT_CONFIG)
+
+
+def save(cfg: dict[str, Any]) -> None:
+    """Write config to disk, creating parent directories if needed."""
+    USER_CONFIG_FILE.parent.mkdir(parents=True, exist_ok=True)
+    USER_CONFIG_FILE.write_text(json.dumps(cfg, indent=2, sort_keys=True))
+
+
+def get_tools_dir() -> Path:
+    """
+    Return the directory where external tools are stored.
+    Creates it if it does not exist.
+    Always an absolute path — never relies on process CWD.
+    """
+    cfg = load()
+    tools_dir = Path(cfg.get("tools_dir", str(USER_TOOLS_DIR))).expanduser().resolve()
+    tools_dir.mkdir(parents=True, exist_ok=True)
+    return tools_dir
+
+
+def get_sudo_cmd() -> str:
+    """Return 'doas' if available, else 'sudo'. Never hardcode 'sudo'."""
+    import shutil
+    return "doas" if shutil.which("doas") else "sudo"
\ No newline at end of file
diff --git a/constants.py b/constants.py
new file mode 100644
index 0000000..b52b400
--- /dev/null
+++ b/constants.py
@@ -0,0 +1,65 @@
+from pathlib import Path
+import platform
+import shutil as _shutil
+
+# ── Repository ────────────────────────────────────────────────────────────────
+REPO_OWNER   = "Z4nzu"
+REPO_NAME    = "hackingtool"
+REPO_URL     = f"https://github.com/{REPO_OWNER}/{REPO_NAME}.git"
+REPO_WEB_URL = f"https://github.com/{REPO_OWNER}/{REPO_NAME}"
+
+# ── Versioning ────────────────────────────────────────────────────────────────
+VERSION         = "2.0.0"
+VERSION_DISPLAY = f"v{VERSION}"
+
+# ── Python requirement ────────────────────────────────────────────────────────
+MIN_PYTHON = (3, 10)
+
+# ── User-scoped paths (cross-platform, always computed at runtime) ─────────────
+# NEVER hardcode /home/username — use Path.home() so it works for any user,
+# including root (/root), regular users (/home/alice), macOS (/Users/alice).
+USER_CONFIG_DIR  = Path.home() / f".{REPO_NAME}"
+USER_TOOLS_DIR   = USER_CONFIG_DIR / "tools"
+USER_CONFIG_FILE = USER_CONFIG_DIR / "config.json"
+USER_LOG_FILE    = USER_CONFIG_DIR / f"{REPO_NAME}.log"
+
+# ── System install paths (set per OS) ─────────────────────────────────────────
+_system = platform.system()
+
+if _system == "Darwin":
+    # macOS — Homebrew convention
+    APP_INSTALL_DIR = Path("/usr/local/share") / REPO_NAME
+    APP_BIN_PATH    = Path("/usr/local/bin")   / REPO_NAME
+elif _system == "Linux":
+    APP_INSTALL_DIR = Path("/usr/share") / REPO_NAME
+    APP_BIN_PATH    = Path("/usr/bin")   / REPO_NAME
+else:
+    # Fallback (Windows, FreeBSD, etc.)
+    APP_INSTALL_DIR = USER_CONFIG_DIR / "app"
+    APP_BIN_PATH    = USER_CONFIG_DIR / "bin" / REPO_NAME
+
+# ── UI theme ──────────────────────────────────────────────────────────────────
+THEME_PRIMARY  = "bold magenta"
+THEME_BORDER   = "bright_magenta"
+THEME_SUCCESS  = "bold green"
+THEME_ERROR    = "bold red"
+THEME_WARNING  = "bold yellow"
+THEME_DIM      = "dim white"
+THEME_ARCHIVED = "dim yellow"
+THEME_URL      = "underline bright_blue"
+THEME_ACCENT   = "bold cyan"
+
+# ── Default config values ──────────────────────────────────────────────────────
+DEFAULT_CONFIG: dict = {
+    "tools_dir":      str(USER_TOOLS_DIR),
+    "version":        VERSION,
+    "theme":          "magenta",
+    "show_archived":  False,
+    "sudo_binary":    "sudo",
+    "go_bin_dir":     str(Path.home() / "go" / "bin"),
+    "gem_bin_dir":    str(Path.home() / ".gem" / "ruby"),
+}
+
+# ── Privilege escalation ───────────────────────────────────────────────────────
+# Prefer doas if present (OpenBSD/some Linux setups), else sudo
+PRIV_CMD = "doas" if _shutil.which("doas") else "sudo"
\ No newline at end of file
diff --git a/os_detect.py b/os_detect.py
new file mode 100644
index 0000000..43ef87f
--- /dev/null
+++ b/os_detect.py
@@ -0,0 +1,128 @@
+import platform
+import shutil
+from dataclasses import dataclass, field
+from pathlib import Path
+
+
+@dataclass
+class OSInfo:
+    system: str                    # "linux", "macos", "windows", "unknown"
+    distro_id: str        = ""     # "kali", "ubuntu", "arch", "fedora", etc.
+    distro_like: str      = ""     # "debian", "rhel", etc. (from ID_LIKE)
+    distro_version: str   = ""     # "2024.1", "22.04", etc.
+    pkg_manager: str      = ""     # "apt-get", "pacman", "dnf", "brew", etc.
+    is_root: bool         = False
+    home_dir: Path        = field(default_factory=Path.home)
+    is_wsl: bool          = False  # Windows Subsystem for Linux
+    arch: str             = ""     # "x86_64", "aarch64", "arm64"
+
+
+def detect() -> OSInfo:
+    """
+    Fully detect the current OS, distro, and available package manager.
+    Never asks the user — entirely automatic.
+    """
+    import os
+
+    system_raw = platform.system()
+    system = system_raw.lower()
+    if system == "darwin":
+        system = "macos"
+
+    info = OSInfo(
+        system  = system,
+        is_root = (os.geteuid() == 0) if hasattr(os, "geteuid") else False,
+        home_dir = Path.home(),
+        arch    = platform.machine(),
+    )
+
+    # ── Linux-specific ─────────────────────────────────────────────────────────
+    if system == "linux":
+        # Detect WSL
+        try:
+            info.is_wsl = "microsoft" in Path("/proc/version").read_text().lower()
+        except (FileNotFoundError, PermissionError):
+            pass
+
+        # Read /etc/os-release (standard on all modern distros)
+        os_release: dict[str, str] = {}
+        for path in ("/etc/os-release", "/usr/lib/os-release"):
+            try:
+                for line in Path(path).read_text().splitlines():
+                    k, _, v = line.partition("=")
+                    os_release[k.strip()] = v.strip().strip('"')
+                break
+            except FileNotFoundError:
+                continue
+
+        info.distro_id      = os_release.get("ID", "").lower()
+        info.distro_like    = os_release.get("ID_LIKE", "").lower()
+        info.distro_version = os_release.get("VERSION_ID", "")
+
+    # ── Package manager detection (in priority order) ──────────────────────────
+    for mgr in ("apt-get", "pacman", "dnf", "zypper", "apk", "brew", "pkg"):
+        if shutil.which(mgr):
+            info.pkg_manager = mgr
+            break
+
+    return info
+
+
+# Module-level singleton — computed once on import
+CURRENT_OS: OSInfo = detect()
+
+
+# ── Per-OS package manager commands ────────────────────────────────────────────
+PACKAGE_INSTALL_CMDS: dict[str, str] = {
+    "apt-get": "apt-get install -y {packages}",
+    "pacman":  "pacman -S --noconfirm {packages}",
+    "dnf":     "dnf install -y {packages}",
+    "zypper":  "zypper install -y {packages}",
+    "apk":     "apk add {packages}",
+    "brew":    "brew install {packages}",
+}
+
+PACKAGE_UPDATE_CMDS: dict[str, str] = {
+    "apt-get": "apt-get update -qq && apt-get upgrade -y",
+    "pacman":  "pacman -Syu --noconfirm",
+    "dnf":     "dnf upgrade -y",
+    "zypper":  "zypper update -y",
+    "apk":     "apk update && apk upgrade",
+    "brew":    "brew update && brew upgrade",
+}
+
+# Core system packages needed per package manager
+REQUIRED_PACKAGES: dict[str, list[str]] = {
+    "apt-get": ["git", "python3-pip", "python3-venv", "curl", "wget",
+                "ruby", "ruby-dev", "golang-go", "php", "default-jre-headless"],
+    "pacman":  ["git", "python-pip", "curl", "wget",
+                "ruby", "go", "php", "jre-openjdk-headless"],
+    "dnf":     ["git", "python3-pip", "curl", "wget",
+                "ruby", "golang", "php", "java-17-openjdk-headless"],
+    "zypper":  ["git", "python3-pip", "curl", "wget", "ruby", "go", "php"],
+    "brew":    ["git", "python3", "curl", "wget", "ruby", "go", "php"],
+}
+
+
+def install_packages(packages: list[str], os_info: OSInfo | None = None) -> bool:
+    """Install system packages using the detected package manager."""
+    import subprocess
+    if os_info is None:
+        os_info = CURRENT_OS
+
+    mgr = os_info.pkg_manager
+    if mgr not in PACKAGE_INSTALL_CMDS:
+        print(f"[warning] Unknown package manager. Install manually: {packages}")
+        return False
+
+    cmd_template = PACKAGE_INSTALL_CMDS[mgr]
+    pkg_str = " ".join(packages)
+    cmd = cmd_template.format(packages=pkg_str)
+
+    # Prepend privilege escalation only on Linux (brew on macOS doesn't need sudo)
+    if os_info.system == "linux" and not os_info.is_root:
+        from constants import PRIV_CMD
+        cmd = f"{PRIV_CMD} {cmd}"
+
+    result = subprocess.run(cmd, shell=True, check=False)
+    return result.returncode == 0
\ No newline at end of file
diff --git a/tools/__init__.py b/tools/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tools/others/__init__.py b/tools/others/__init__.py
new file mode 100644
index 0000000..e69de29