Paca is a new open-source project management tool positioning itself as a lightweight Jira alternative designed around human-AI collaboration. Submitted to Hacker News by its creators as a Show HN post, the project is hosted on GitHub under the Paca-AI organization. It targets developers and small teams seeking leaner task-tracking infrastructure that accommodates AI agents as first-class contributors alongside human team members.
Ethan Mollick’s One Useful Thing post announces or frames Co-Existence, the follow-up to Co-Intelligence. The core shift is from prompting chatbots as collaborators toward living and working alongside increasingly embedded AI systems. It is best read as commentary and book positioning, not a technical release, benchmark, or tool tutorial.