They Use PostSharp
Starcounter
We simply couldn???t find anything near PostSharp in functionality, stability and well-written trustable code. And nothing was even close. PostSharp offers everything we need and even more.
Per Samuelsson, co-founder of Starcounter Ltd.
DataObjects.NET
PostSharp provides an opportunity to do anything with IL code ??? there are really no code weaver comparable to it.
Alexander E. Yakunin, president and CEO of Xtensive LLC.