We have successfully integrated gvk's mod manager into GameBanana for all mod types for RWBY: Grimm Eclipse. It's still being tested and also we have very few mods for Grimm Eclipse. But it's great to have another integrated mod manager on GB (Meteor was the first). Thanks gvk!
If you know of a mod manager that is being actively developed, let me know! I've been reaching out see if devs want to integrate with us.