101 aggregates knowledge about software languages and technologies. 101wiki is the semantic wiki access point to 101. 101's contributions are small systems exercising languages and technologies by implementing features for a simple information system with source code available on GitHub. 101 is used in courses. 101wiki is used in some Open Source projects, e.g., MetaLib and YAS. The 101wiki may also be accessed through 101linkeddata in Linked Open Data manner. Contributions to 101 are welcome.