Code review and repository browsing tool from JetBrains
JetBrains Upsource is a team collaboration tool that enables web-based browsing and review of source code in repositories based on Git, Mercurial, Subversion and Perforce.
Additionally, Upsource provides bonus functionality for Java/PHP/JavaScript/Python/Kotlin projects such as revision-specific code inspections, search for code symbols, Go to Declaration, Find Usages, Quick Documentation and Type Hierarchy, which all work on the server in much the same way as in IntelliJ IDEA.
Upsource integrates with JetBrains IDEs and Android Studio through a plugin so that developers could participate in peer code reviews from their IDEs.