Multiplayer mod Zxc by 291 (Blender.pro) for Half-Life 1 with free source code. Over 30 different weapons (including old), features and relatively high stability of the HLDS.
This is the most recent version of the zxc mod. Unfortunately the official mod website is gone. So there's no opportunity to get the needed client files (all the missing sprites and so on). This was the desired object: halflife.exe If there's anybody out there who owns this halflife.exe-Pack please upload it here and share it with the other zxc-fans.