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, copy&paste this to the first post. And please, uncheck "Automatically retrieve titles from external links" before applying the edit.
Right now it would be cool to get this thread sticky since everyone seems to be suddenly working on S4 private servers!
EMULATOR PROJECTS
FagNet
FagNet is the first working and most popular private server emulator coded by wtfblub for S4 League Europe Patch 9. Written in C#.
Original version:

Wizzardo aka huenato's version:

TempestCore version:
GodNet
GodNet is a FagNet S4 League Emulator implementation purely written in NodeJS.
FagNet rewrite in VC++
This is an attempt by Decrypted to rewrite FagNet in Visual C++ and improving the game client.
Pentaleague
Pentaleague is a work-in-progress emulator written in C++ based on the ENet network library.
NetspherePirates
NetspherePirates is the second experimental work-in-progress S4 League server emulator for Patch 26 (Season 1) by wtfblub. Written in C#

PLAYABLE PRIVATE SERVERS
ArchieZone S4
A FagNet-based private server with as many compatible or unreleased weapons/maps/skills as possible.
USEFUL TOOLS AND INFORMATION
Resource tools
All 6 resource tools created for S4 League in one archive.
SCNReader and SCNPatcher
3D Model reading/patching programs written in NodeJS.

SCN XeNTaX thread
SCN models format research in XeNTaX.com by Seyren.
Massive collection archive
Various FagNet builds, tutorials, tools, entire clients and more put together for backup purposes.
Patch list 2008-2013
The complete list of downloadable patches from the official European servers, starting from October 2008 to August 2013
S4 Portable
S4 Portable allows you to play a modded FagNet client offline/in single player. Useful for experiments, and to possibly improve the Patch 9 client.
CONTRIBUTORS
wtfblub aka -PinkiWinki- -> developer of FagNet emulator, NetspherePirates emulator, and various Resource tools
Deverixz -> possible server hoster supporting Linux (or Mono)
dokayhan -> possible server hoster
ArchieZone team:
jazzy348 -> server hoster with DDoS protection
Domarije -> patcher/launcher developer
Shanzenos -> client modder
Pentaleague team:

-> C++ & Reverse Engineering

-> C++ & Reverse Engineering

-> GFX & Modelling

-> SQL & Webshit