Mailjoy - Delightfully easy direct mail marketing. A DIY direct mail tool created for marketing and growth teams. Design, mail & track personalized direct mail postcards and letters. Digital marketers use Mailjoy to send data-driven mail campaigns.
Mac CLi - OS X command line tools for developers
I hate mailto - Stop websites from opening your email client.
You-Get - Command-line utility to download media contents from the web
RealMailers - Send geo-targeted direct mail to 110M+ homes in the US
Soft Serve - Soft Serve is a self-hostable Git server with a built in SSH interface, built for the command line.