> For the complete documentation index, see [llms.txt](https://openmetacity.gitbook.io/omc-v0.7-en/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://openmetacity.gitbook.io/omc-v0.7-en/platform/sub-systems.md).

# Sub systems

- [Open Community](https://openmetacity.gitbook.io/omc-v0.7-en/platform/sub-systems/open-community.md)
- [DAO Building Upgrade System (TBU)](https://openmetacity.gitbook.io/omc-v0.7-en/platform/sub-systems/dao-building-upgrade-system-tbu.md)
- [Meta Bank System (TBU)](https://openmetacity.gitbook.io/omc-v0.7-en/platform/sub-systems/meta-bank-system-tbu.md)
- [Map System](https://openmetacity.gitbook.io/omc-v0.7-en/platform/sub-systems/map-system.md)