[styren]

We've been using Togglz (https://www.togglz.org/) and have had no issues so far. FF4J does seem to be a bit more feature rich though.

[brightball]

I've been interested in trying Unleash. Looks like a very polished, cross language option that appears to directly integrate with Gitlab too.

https://www.getunleash.io/

[monknomo]

I use unleash pretty heavily and it works well

[jdwyah]

I just put together a comparison yesterday of some tools and I found unleash to be more unwieldy than I expected. I wanted to set the result to a specific value for a shared segment and couldn't do it. For some reason the overrides didn't let me use a segment. Was I doing it wrong?

[victor106]

does it support Spring?

[campfireman]

We recently switched from ff4j to togglz and are very happy with the choice.

ff4j's audit feature was buggy and caused our database to run full with entries: Togglz' simplicity is a feature I guess :)

Added plus: Togglz is maintained by people from my corp.