General Items

• It has a github repo
• It has a proper LICENSE file
• It's hooked to a hipchat room
• It's has a clear and useful README.md
• It's documented (with examples)
• It's tested

Exhibition

• There is a blog post about it
• It's shared on social networks
• It's shared on reddit
• It's shared on hacker news with a title like Show HN: description
• It has a landing page built in github pages

For Libraries

• It provides a sample application
• Examples of use are documented in the README or linked from there

For Erlang Projects

• It's checked with Elvis