Mosaically lets you create your own photo mosaic using your own pictures. It also lets you share your photo mosaic and invite others to add their own photos.

Mosaically is a free online software for creating and sharing beautiful high resolution zoomable photo mosaics made using your own pictures.

AndreaMosaic, a photographic mosaic Software. With this freeware program you can create your own photographic mosaics made with your own pictures!