I'd add: * Hangfire * Quartz.NET * NHibernate * AutoMapper * StackExchange.Redis * the Castle project * xUnit * NUnit * Serilog * SimpleInjector Thes

I'd add: * Hangfire * Quartz.NET * NHibernate * AutoMapper * StackExchange.Redis * the Castle project * xUnit * NUnit * Serilog * SimpleInjector These are all very popular long maintained open source libraries I've seen used in many projects.