DXR - Powerful code search for large codebases.
GitHub Folder Downloader - Download a single folder of a repository without cloning or downloading the whole repository.
CodeWyng - CodeWyng brings documentation on hover, click to jump-to-definition, and IDE-like features to GitHub PRs.
GitZip - Download or create a download link for a GitHub project folder/sub-folder or file.
Open HUB - Open HUB is an open source directory that anyone can edit.
DownGit - Directly download or create download links to GitHub public folders or files.