Yarrn! is a new free app that allows you to access your knitting and crochet projects on http://www.ravelry.com
The great folks at Ravelry offer access to their data to anyone willing to build an app and so, while my lovely wife is knitting the next shawl or hat, I go on and knit her an app for that. In the current version you can see your projects and update the progress as well as upload photos. Also your stashes and the list of favorited projects and patterns can be accessed from the app.
This is just the beginning, I hope to add a lot more in the future. If you like what you see and would like to see more, don't hesitate to shoot me an email with your wishes what to add to the app next.
Have fun with your needles and yarrn!
P.S. Yarrn! is OpenSource available at https://github.com/KoljaTM/Yarrn