Toxiproxy - Toxiproxy is a framework for simulating network conditions to prove with tests that the application doesn't have single points of failure.

UnitTest++ - Download JF Unittest for free. A C++ unittest framework, written out of frustration with the existing unittest frameworks out there. No GUI with colorful progress bars, no dependencies on any other package in the world.

Google Test - Google Test is a unit testing for C++ programming language that is based on xUnit architecture.

Spock - Spock is leave / vacation tracker for Slack

Cantata - "Module testing early during development is becoming more important due to the increasing complexity of software.

Criterion - A dead-simple, yet extensible, C test framework.