Is there any advantage of spending more effort and time on an opensource image annotation application?

https://naturalintelligence.github.io/...

I've just done with imglab v2. Two reasons I've developed it is to use it without installation (on web) and integration with open libraries (face++ currently) for fast annotation.

It has more features than above 2 and many are in queue. But as their are many annotation library already available, I'm not able to decide if it is worthy to spend more time on this.

What do you suggest?