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DXR - Powerful code search for large codebases.
openDesktop.org - The website openDesktop.
CodeWyng - CodeWyng brings documentation on hover, click to jump-to-definition, and IDE-like features to GitHub PRs.
SourceForge - The Complete Open-Source and Business Software Platform.
Open HUB - Open HUB is an open source directory that anyone can edit.
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.