Even though mod community of Arma is still not familiar with Enfusion Engine, there are actually pretty decent mods out already. Here is my best Arma Reforger list so far:

• Where Am I - shows your location on map since you have to estimate your location on map yourself in base game.
• Better Hit Effects - This mod improves the explosions and impacts
• Better Tracers - makes tracers more visible
• Sample Mods by Bohemia Interactive - cars, guns, scripts and more mods provided by developers
• King of the Hill AI - a singleplayer mod that mimics the KOTH in Arma 3 
• Unflip Vehicles - Adds an option to unflip vehicles

there are a few zombie mods but still need lots of improvements. I hope CUP community is working on a great mod pack...