GitHub Hovercard might be a bit more popular than DXR. We know about 1 link to it since March 2021 and only 1 link to DXR. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
There is DXR from Mozilla but I'm not sure how generalised it is. https://github.com/mozilla/dxr There is also Sourcegraph. - Source: Hacker News / about 3 years ago
GitHub Hovercard brings you instant access to quick information about the user, repo, issues, commits, and pull requests information from anywhere on GitHub. - Source: dev.to / about 2 years ago
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+.
GitZip - Download or create a download link for a GitHub project folder/sub-folder or file.
OpenGrok - OpenGrok is a fast and usable source code search and cross reference engine.
Refined GitHub - Browser extension that makes GitHub cleaner & more powerful
LXR - LXR Cross Referencer, usually known as LXR, is a general-purpose source code indexer and cross-referencer that provides web-based browsing of source code, with links to the definition and usage of any identifier
DownGit - Directly download or create download links to GitHub public folders or files.