[damurdock]

Reddit's programmer subs are pretty nice, although they tend to be inactive for smaller languages/tools/topics.

Do people still use IRC? Where is active these days?

[J_Darnley]

IRC channels for projects can be quite lively. The busiest channels I idle in are #ffmpeg-devel and #lua on freenode. Clearly these are dedicated towards these projects but sometimes other chat filters in. #lua certainly gets that.

Others can be much more quiet and be usually for tech support of a project but they can still be a good place to contact people working on a project.