Monitoring and profiling tool for .Net solutions like VisualVM for Java

Commercial:

 

ANTS Memory Profiler:
http://www.red-gate.com/products/dotnet-development/ants-memory-profiler/

ANTS Performance Profiler:
http://www.red-gate.com/products/dotnet-development/ants-performance-profiler/

NET Memory Profiler: http://memprofiler.com/

JetBrains dotTrace : http://www.jetbrains.com/profiler/download/index.html

SciTech Memory Profiler: http://www.scitech.se/

 

Free:

CLR Profiler :  http://msdn.microsoft.com/en-us/magazine/ee309515.aspx

SOS Debugging Extension: http://msdn.microsoft.com/en-us/library/ms404370.aspx

Slimtune:https://github.com/bendetat/slimtune