log4net - log4net is a tool to help the programmer output log statements to a variety of output targets.
HubSpot - Grow Better With HubSpot: Software that's powerful, not overpowering. Seamlessly connect your data, teams, and customers on one CRM platform that grows with your business.
Serilog - Backend Development and Utilities
MailChimp - MailChimp is the best way to design, send, and share email newsletters.
LOGBack - Logging framework
Marketo - Marketo's powerful marketing automation software helps marketers master the art & science of digital marketing to engage customers and prospects.