openDesktop.org - The website openDesktop.
OpenGrok - OpenGrok is a fast and usable source code search and cross reference engine.
SourceForge - The Complete Open-Source and Business Software Platform.
Sourcegraph - Sourcegraph is a free, self-hosted code search and intelligence server that helps developers find, review, understand, and debug code. Use it with any Git code host for teams from 1 to 10,000+.
Freecode - Freecode (formerly known as Freshmeat) is one of the legit open source development platforms that will be the key for developers and programmers to have a streamlined process via having enhanced collaboration and coding leverages.
DXR - Powerful code search for large codebases.