mozdev.org
mozdev.org was a website that offered free project hosting, and software development tools to the Mozilla community. Site hosted extensions for Firefox, Thunderbird and SeaMonkey and stand-alone Mozilla-based applications. It was free to set up a project there, but all development must have been done using a license approved by the OSI. According to the site, at one point it hosted over 250 active projects. It was shut down in July 2020 and currently redirects to mozilla.org.