It's a cyberpunk-themed idle game, where you crack open servers to loot them and explore their secrets. You can do this manually, but the real fun and challenge is in writing scripts to massively automate the process.
Main repository (including API docs): https://github.com/bitburner-official/bitburner-src
Official Steam page: https://store.steampowered.com/app/1812820/Bitburner/
Web-based version: https://bitburner-official.github.io/
Major features in 3.0.0 include:
- A new type of network with unstable, shifting connections. This new network requires writing programs that spawn, stay resident, propagate and terminate themselves.
- Certain factions now have special campaigns associated with them, which you can choose to assist.