"Is libreCMC still under active development?"
Yes. "the last release from last year."What?! No it's not. Version 1.3.4 came out two months ago in July: https://librecmc.org/librecmc/downloads/snapshots/v1.3.4/ar71xx/luci/
You should visit their IRC channel. It's quite active. Some people were talking about VoIP stuff in there earlier today.
