Precise Calculator is a free open source scientific calculator for Windows.
You can adjust precision of this calculator (for example to 10000 digits). It knows all usual mathematical functions, statistical functions, prime numbers, PI, matrices, complex numbers, fractions, integral and it is programmable (variables, commands if, goto, print, return, …).
CudaText is a cross-platform text editor, written in Object Pascal. It is open source project and can be used free of charge, even for business. It starts quite fast: ~0.3 sec with ~30 plugins, on Linux on CPU Intel Core i3 3GHz. It is extensible by Python add-ons: plugins, linters, code tree parsers, external tools. Syntax parser is feature-rich, from EControl engine.
Open and View Corrupt PDF Files on Windows PDF Fixer ScreenshotIf you get the “file has been damaged” or the “this is a corrupt PDF” error messages while opening a PDF file with the PDF reader program, that means this PDF file is corrupted and cannot be opened. Corrupt PDF Viewer is a small utility that enables users to open and view damaged PDF files on Windows instantly.