Pico Labs has implemented Pico Agents and is beginning work on https://github.com/Picolab/aries-cloudagent-pico (Aries cloudagent Picos). In the previous sentence each name is linked to the corresponding code repository in GitHub.
The Aries specification is maintained by the Aries community in a GitHub repo. Each part of the specification is called an “RFC” and they are grouped into concepts and features. Pico Labs maintains a fork of the official repo (for making pull requests) and we strive to keep the fork even with the Aries repo. Instructions for making a pull request located here.