[Arma2] Kegetys ArmAII Game Launcher by Kegetys
Just like the game launcher from ArmA, this version for ArmAII lets you mix and match your mod / mod folders at time of launch as well as join MP servers etc
The ArmAII version has 1 extra nice feature: There is an "Auto Scan" feature that lets the tool find the Mod folders for you. (They have to have a @ at the front of the folder name)
Released long ago, but seeming lost for a while.