Reactive collections based on Rx.Net
Quartz Enterprise Scheduler .NET
GELF log4net Appender - graylog2
Castle Windsor is a best of breed, mature Inversion of Control container available for .NET and Silverlight
Castle Core, including Castle DynamicProxy, Logging Services and DictionaryAdapter
2nd level caching provider for NHibernate using Couchbase
Redmine is a flexible project management web application written using Ruby on Rails framework. http://github.com/edavis10/redmine is the official git mirror of the svn repository
QuickFIX/n implements the FIX protocol on .NET.
Graylog2 is an open source syslog implementation that stores your logs in ElasticSearch. It consists of a server written in Java that accepts your syslog messages via TCP or UDP and stores it in the database. The second part is a Ruby on Rails web interface that allows you to view the log messages.
Schedules is a plugin to manage users and assigned projects over time.