OpenCover - OpenCover is a code coverage tool for .NET
SonarQube - SonarQube, a core component of the Sonar solution, is an open source, self-managed tool that systematically helps developers and organizations deliver Clean Code.
dotCover - JetBrains dotCover is a .NET unit test runner and code coverage tool that integrates with Visual Studio.
JaCoCo - JaCoCo is a free Java code coverage library.
Codecov - Develop healthier code using Codecov's leading, dedicated code coverage solution. Try it free
NCrunch - NCrunch is an automated concurrent testing tool for Visual Studio .NET.