Extrex

If you are a mechanic, an electrician, or a general technical engineer, a simple calculator will give you as much as recording on a recorder when you wanted to watch a movie on DVD. For example, RealCalc will come to your aid in this case. This is an engineering calculator, made in the style of ordinary "live" calculators of this type.

There are already roots in degrees, fractions, the ability to count both in degrees and in radians. Intuitive interface without a pile of unnecessary superstructures and submenus. This calculator has as much as 10 memory cells. It is possible to see the history of calculation results.

Plus the "keep screen on" feature so that the phone screen does not go out while you record the results.

Quip is not just a fast notebook, it is a mobile office for Android. In the free version of the application are available all the necessary basic functions (record keeping, information storage, media files, etc.), and in the paid version - the possibility of teamwork.
Features of the service: sorting documents and folders; history of editing; ability to create task lists; shared access and chat; reliable protection of privacy; integration with Microsoft Excel, Dropbox, Evernote, Salesforce, Gmail, Zappier, etc.; import and export of files in PDF format and Microsoft Office.