Thinkingwithportals.com

Thinking With Portals is a community based website focused on creating new maps for Portal and Portal 2. The site has been active since 2007. They offered a massive database of custom made Portal maps. They also promoted mapping contests regularly such as their Summer Mapping Initiative and Heavy-duty Super-mapping Super-contest. It went offline in December 2015, and was restored on May 4th 2017 with the new domain "thinking.withportals.com".

Contests

 * Summer Mapping Initiative
 * Heavy-duty Super-mapping Super-contest