GnuPlot - Gnuplot is a portable command-line driven interactive data and function plotting utility.

Bitly - Get the most out of your social and online marketing efforts. Own, understand and activate your best audience through the power of the link with Bitly Enterprise.

Dr. Geo - Dr. Geo, a software to design & manipulate interactive geometric sketches.

Rebrandly - Rebrandly is the easiest way to create, share and manage branded links.

Giac/Xcas - Free computer algebra system

Short.io - Short.io makes short links (vanity urls) on your own domain. Free signup, analytics and API. Chrome, slack, zapier and segment integrations.