Klocwork
Static code analysis and SAST for C, C++, C# and Java
MoreUnit
Eclipse plug-in that helps write and navigate unit tests
ObjexxFTK
Fortran toolkit with unit testing support
PurifyPlus
Run-time analysis suite: memory errors, performance and coverage
VB Watch
Profiler, error protector and debugger for VB6
ARCAD
DevOps, testing and modernization tools for IBM i applications