I also have a level type app but don't really use it. And apps to measure sound level and vibration which I've used more as a curiosity to see how loud power tools are and how much vibration various they have.
Newer had much use for digital tools in the shop and try to keep my shop time non-digital as much as possible.
Use a normal pocket calculator mostly and some times helped by this simple triangle solver: http://www.pagetutor.com/trigcalc/trig.html
Not sure if it counts but have had immense use and joy from using youtube as a learning platform in the many corners of the wood working world. Would think that a carefully curated list of videos somehow packed (and frequently updated) would be usefull to many.
I keep certain sites on the browser of my smart phone…LJ(of course), Wood-database.com, Blood and Gore,...for quick reference(depending on connection-usually unavailable when I need it LOL). No Apps, per se. Hadn't really thought about it.
I couldn't live with out sketch up. It is by far the best drawing program I've ever used. http://www.sketchup.com/
But for cabinet work I've used ecabinet systems, free program that includes exploded and rotating views as well as cut sheet calculations. http://www.ecabinetsystems.com/
My family lives about 16 hours away, so I enjoy using the camera on my phone and uploading the pictures to OneDrive (you could also use Google Drive, Dropbox, or any other online storage). I then send my family a link to the project's folder, and they can open that folder any time to see the latest pictures as I progress.
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