Viking is a free/open source program to manage GPS data
...Viking is currently dual managed - with a corresponding Github presence at:
https://github.com/viking-gps/viking
Where you may find it easier to view the code and raise issues there too.
NOTE: Code commits are FROZEN on SourceForge: New code is now at <http://github.com/Xastir/Xastir>. Real-time tracking & messaging of stations via radio/internet APRS data streams, w/125 map formats supported. Linux/FreeBSD/Solaris/MacOSX/Windows in any of 7 languages. Can also be used for mobile mapping w/GPS. MAILING LISTS ARE AT: PROJECT->WEB SITE.
TacitPixel is a scalable C++ framework for building application prototypes for interactive collaborative VR/AR applications. It provides a number of features that make prototyping fast and portable.
TacitPixel is the successor of the TAP and Twisted Pair engines.