[tpoindex]

Adding two of my favorites:

XMorph - blends two images together: https://xmorph.sourceforge.net/home/gourlay/public_html/Xmor...

ACM - Aerial Combat Simulator: https://www.gnu.org/software/acm/

[em-bee]

xmorph was awesome. i'd love to see a more modern version of that that produces better quality results.