Open Source Issue Tracking Software in C#

BTsys is a lightweight desktop bug tracking system, written using C# and ADO.NET for accesing to database

BugBye is a web-based bugtracking system developed using ASP.NET technology and C# as scripting language

A bug logging and tracking solution with file attachments and history of comments

An open source web based bug / issue tracking application programmed in C#

BugTracker.NET is an easy-to-use web-based bug tracker written using ASP.NET and C#