Capsomnia
Keep your Mac working even with the lid closed.
Capsomnia turns the Caps Lock key into a physical switch that keeps your MacBook awake with the lid closed. It is ideal for running agents such as Claude Code and Codex, while keeping SSH sessions, builds, and downloads active. The keyboard LED shows the current state at a glance, while an automatic timer lets you choose when normal sleep should resume. Free and open source, with no accounts, telemetry, or network requests.