The phrase "active development" means that something is currently being worked on or improved. It suggests that there are ongoing efforts to make progress and bring about changes or updates. Full definition
It's nice to have confirmation that it's still in active development, but it could be years before it's ready for beta testing. (bytesizeimpressions.com)
These malware variants have been under active development since at least 2009. (operationblockbuster.com)
The main reason that the G6 makes this list is the fact that is has a very active development community, so you should never be hard up for cool mods and root apps. (android.gadgethacks.com)