Stitches - don't like big sprite-sheets but is easy to use and works online
if you can't save the sheet, use right mouse button and "picture save as"
edit (related to next post):
ImageMagick works also in Windows and you can create sheets with commandline-input like this:
Code: Select all
montage meg-va????.png -tile 4x4 -geometry 128x128+0+0 meg-sheet.png
(Sprite Sheet Packer - Full Program - no problems with sheets bigger 2048x2048px)