Fisheye is a revision-control browser and search engine owned by Atlassian, Inc. Although Fisheye is a commercial product, it is freely available to open source projects and non-profit institutions. In addition to the advanced search and diff capabilities, it provides:

Use in open-source projects

Atlassian approves free licenses for community and open-source installations under certain conditions. Many major open source projects use Fisheye to provide a front-end for the source code repository: Atlassian provides free licences of Fisheye and Crucible for open-source projects.

Integration

Fisheye supported integration with the following revision control systems: Due to the resource-based URLs, it is possible to integrate Fisheye with different issue and bug tracking systems. It also provides a REST and XML-RPC API. Fisheye also integrates with IDEs like IntelliJ IDEA via the Atlassian IDE Connector.