We have just released version 1.0.1 of the C5 generic collection
library for C# and .NET.

C5 is the most powerful and well-documented collection library
available for C# and .NET, and thoroughly tested.

Since the release of version 1.0.0 five months ago, thousands of
developers have downloaded it (and found a total of six bugs, now
fixed).

Get the library for free from http://www.itu.dk/research/c5/ including
documentation and tutorial in the form of a comprehensive technical
report. It is open source software with a liberal BSD-style license.

Niels Kokholm and Peter Sestoft