OctoPrint is the snappy web interface for your 3D printer
Google maps for block game
Pandas on AWS, easy integration with Athena, Glue, Redshift, etc.
Minimalistic wide-open GPS-locator/tracker
Test and measurement automation for electronics, physics and more
Cross platform Perl API to control NexStar compatible telescopes
GHDL - a VHDL simulator
Multidimensional image registration, segmentation and statistics
Systems Biology and Evolution Toolbox (SBEToolbox).