# Sub systems

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