LearnMMD.com shows you how to use the freeware GIMP to create an animated GIF from your MMD performance. Reggie Dentmore shows you where to get the GIMP software and how to create your own animated GIFs.
My TDA Append Chibi Zatsune Miku Animation. Look it. http://fav.me/d4zo6kh
1) Open MikuMikuDance Version 7.3.9
2) MikuMikuDance in open PMD and PMX.
3) You need open Motion MMD.
4) Render to Picture File rename {name}.PNG.
5) You can skip two for Render to Picture File again.
6) Open GIMP
7) PNG File put on Layers.
8) Change Layers upside-downside.
9) File > Export (Make GIF)
10) Click As animation.
11) Animated GIF Options
Loop