I like both develop bug management softeware.
Log4net belongs to apache company, which is log4j's little brother. log4net use for .net platform.
also it's opensource and free. I see a microsoft develop use it as well. so I like it very much.
log4net is a tool to help the programmer output log statements to a variety of output targets.
log4net is a port of the excellent log4j framework to the .net runtime.
using it with sping and hibernate, will make them more better.
Nunit is free and opensource software. it can make the Testing work automated. I am using it to go through
the whole development process.
Nunit is a unit-testing framework for all .Net languages. Initially port from Junit. Nunit brings
xUnit to all .Net languages.
Here I offer some links: