By A Mystery Man Writer
XCOM 2 has announced during a Q&A Event that they will be providing modders with tools for their upcoming release that opens the possibility for co-op.
Steam Workshop::XCOM 2: Tactical Co-Op
XCOM 2 Mod Recs: Content Mods
Review: XCOM 2
XCOM 2 - Cooperative Campaign Mod (Mod Library)
The 10 Best XCOM 2 Mods You Should Consider Downloading
Psi Operative (XCOM 2), XCOM Wiki
Fallout 4 PC Mods: What we want on PS4 and Xbox One
Steam Workshop::Dragonpunk: Soldiers of Fortune
XCOM 2 - Wikipedia
XCOM 2's multiplayer will be shut down this month