asterisk.cr is a Crystal-lang all-in-one Asterisk PBX library - ARI, AMI, and all types of AGI - by Andrius / the ctiapps org (github.com/ctiapps/asterisk). Examples and demos live in the sibling alice_calls repo. Last commit 2019-10-26.
Crystal (shard.yml, src/), Docker (Dockerfile-13, Dockerfile-16). Test: crystal spec.