These are the active projects, that are active and maintained today.

https://zircleui.github.io/docs/	Zooming UI and menu system using zoomable circles
http://prezi.com/	Zooming presentations: To inspire change, change your presentation tool (in Browser and standalone)
http://mural.ly/	Visual zooming collaboration for creative people (runs in browser using Javascript)
http://eaglemode.sourceforge.net/	Zoomable environment for applications and files (runs as Linux/Windows application)
http://openseadragon.github.io/	Open Seadragon
http://www.filemap.info/	Filemap
http://www.raskinformac.com/	Raskin for Mac

Zoomable maps

http://maps.google.com/	Google Maps
http://www.bing.com/maps/	Bing Maps

Let me know if you want an an entry here or something is not working anymore at zbalai