What open source .Net utility projects or code libraries do you use?

Question

I use log4net in just about every code project. I was wondering what other generally useful code projects are available?

Answer 1

I like the C5 collection classes, from the IT University of Copenhagen:

http://www.itu.dk/research/c5/

It's one of the most well-designed libraries, of any kind, I've ever used.

Answer 2

• Rhino.Mocks
• NUnit
• NHibernate
• Spring.NET
• Castle
• My own somewhat eclectic MiscUtil
• PostSharp

Answer 3

Some useful open source tools/projects I've used in .NET development:

• 7Zip
• HtmlAgilityPack
• Mono
• SharpDevelop

Answer 4

• Castle ActiveRecord
• ICSharpCode.SharpZipLib

Answer 5

Many of the ones already mentioned, plus

• SharpZipLib
• Fast CSV reader

Answer 6

I would tend to agree with Jon Skeet, except that if you had to name just one, I would start with NUnit.

Please, test your code!

Answer 7

I maintain a class library called SixPack

http://code.google.com/p/sixpack-library/

Answer 8

For PDF manipulation
iTextSharp