Free metamod software for linux

Metamod project is a plugin/DLL manager for Half-Life servers.
Metamod is a plugin/DLL manager that sits between the Half-Life Engine and an HL Game mod, allowing the dynamic loading/unloading of mod-like DLL plugins to add functionality to the HL server or game mod.
The purpose of MetaMod is to function "one level up" from the normal Half-Life game mod DLL. Sitting between the mod game DLL and the Half-Life engine/binary, it intercepts the function calls between the two, with the option of passing them along untouched, as well as passing them on to as any number of additional mod-like DLLs.
Thus, you can actually have multiple "mod-like" DLLs in operation at one time. I say "mod-like" because these additional DLLs (well call them "plugins") are not intended to provide a full "game"; that functionality is still provided by the "game dll". However, these plugins can add to or modify the functionality provided by the game dll, or by the engine itself - for instance, adding new server commands, or new client commands, or even disabling commands built into the game dll. Although the plugin isnt intended to provide full HL-game functionality, since its receiving the same information given to the game DLL, it has the opportunity to do anything the game DLL can do (given enough coding effort of course).
This is very similar to the way Alfred Reynolds AdminMod works, as it also sits between the engine and game dll, catching routines, and passing them on. thus modifying functionality. However, rather than providing just the additional server features builtin to AdminMod DLL, MetaMod allows you to add features from multiple, separate DLLs. Under that framework, AdminMod can be a plugin itself, and be run alongside numerous other plugins. And, as of version 2.50 of AdminMod, AM has now transitioned to running as a Metamod plugin.
Enhancements:
- Added support for new HLSDK API functions QueryClientCvarValue2() and ClientCvar2().
- Added GET_HOOK_TABLES() to let plugins make interceptable engine/dll calls.
- Added MAKE_REQUEST_ID() to assist plugins in generating request ids for QueryClientCvarValue2().
- Added mod support for Move In! 1.0, and Special Death Match Alpha 2.0.
- Fixed a bug where Windows DLL load failures produced an empty message.
- Fixed a bug where plugins could not catch NewDLL calls for GameDLLs that do not provide NewDLL information.
- Fixed a bug corrupting memory when using Metamod with engines or game dlls with a different interface than the one compiled against, e.g. older engines.

Half-life Admin MOD project is an administration plugin mod to Half-Life servers.
Admin Mod is a Metamod plugin that allows you to administer your Half-Life server while playing the game from your client console. Multiple administrators with different permissions can be set up, each with their own password. You dont need to give your servers rcon password to all your administrators anymore.
It also supports scripts written in the Small programming language that add new features to the core program.
Main features:
- Works on dedicated and listen servers on the Internet and on a local area network.
- Set different access levels for each authorised administrator.
- Reserve server slots for administrators.
- Make the server a "private" server only accessible by registered users.
- Kick, ban or gag disruptive players.
- Change maps through direct commands or a vote
- Balance teams
- Restrict weapons
- Over 200 contributed scripts available to provide more features
Admin Mod is compatible with all Half-Life based games that are compatible with Metamod and runs on Windows and Linux/FreeBSD operating systems. It is currently used on over half of all Half-Life servers active on the Internet.
Enhancements:
- Added a 64bit Linux version for AMD64.
- Revised Windows installer install_admin.vbs to properly detect new Steam accounts and have a more consistent user interface.
- Added cvar_exists() scripting function to check if a cvar exists or not.
- Added get_timer() scripting function.
- Added valid_mapex() scripting function.
- Admin Mod is now unloadable at any time.
- Allow the use of the loopback IP 127.0.0.1 in the users.ini file.
- Added format directives l and h for snprintf() to specify long or short values.
Revised plugin_CS:
- Added possibility to delete previously saved map and server default restrictions.
- Added console/screenmessage when saving/deleting default restrictions.
- Added a submenu to the restrictionmenu "Restrictions defaults" wich can save, delete and apply the map and server default restrictions.
- Fixed a bug where admin_restrict listed the longer list of items/weapons instead of the shorter one.
- Improved version detection, using the new cvar_exists() function.
- Implemented team- and playerspecific restrictions.