So yea, in case you didnt already know, and you're a fan of Anomaly and/or GAMMA and you have friends to play with, there is a very solid co-op mod available to the public now. Myself and a friend just finished a 60 hour playthrough of GAMMA and our overall experience was very solid.
The mod is called xrRazom, and the link is here: https://www.moddb.com/mods/xrrazom-stalker-anomaly-co-op
It's a very straight forward install, just make sure to read the Moddb install info and follow the directions.
As for bugs or issues you may run into;
- There are some quest icon desync issues that the cooperator players will experience with item turn in quests as well as A-life moving target quests, (host still tracks them fine)
- Cooperator players receive no task rewards for escort quests, so don't even bother escorting STALKERS in the current patch.
- Rare, but it does exist, is enemy placement desync. Sometimes the cooperator player may not see enemies in certain locations that the host sees them. This got us killed a small handful of times.
- If the host loots a body, the cooperator may see ammo that can't be looted on the bodies.
- Northern zones such as Jupiter/Zaton were already a bit laggy in patch 0.9.5 due to more AI and AI logic mods, but now with co-op it's even worse (still very playable though). Once we got to this portion of the playthrough our loading screens would random take minutes at a time sometimes, and other times only 10 seconds. Our FPS also took a massive hit, and it's not our systems, my buddy has a 9950x3d with a 5080, I have a 13700k with a 5090.
Other than these slight issues, our experience was very positive and I look forward to seeing how much improvement can be made to this mod in the future. Hopefully more people spread the news of this mod.