Cross platform (Windows, Linux, Mac, Amiga, OS/2, others, even Android and iOS)
Open-source, see its GitHub page
Free of charge (although it encourages charity donation), GPL license with ...
One tool that I've been using is called Pygubu. It's open source and can be run anywhere python is installed. It includes support for not only Python version 3 but also version 2 as well. It appears ...
Cross-platform (Linux, Mac OS, Windows)
Free software (GPL)
Has syntax highlighting support for a lot of different files (Markup, Scripts, Source code, configuration, ...)
Update 2019-08-27: this tool has reached end of life and seems no longer maintained.
All in all, I'd say your wish list for a gratis tool like that is quite long. In the last company I worked for, I ...
Icon Dog is perhaps the best free solution out there for automating the process of resizing app icons. It supports iOS and Mac icons, including the sizes for Apple Watch and CarPlay apps.
In addition ...
I usually use OSes in the *nix family so this may not help:
I'm a big fan of Sublime Text and since it offers a free, unlimited trial (Windows, Mac, Linux), you don't have much to lose.
While it is ...
Important to note that typically for commercial purchases I believe companies might opt-in to getting IntelliJ instead as to unlock all languages supported by Jetbrains. This post, however, ...
Vanilla GDB satisfies you constraints. gdb -tui is based on curses.
Also, GDB is capable of advanced customization using .gdbinit. You might get inspired by these ones:
(I've salvaged several answers from the now-deleted StackOverflow question page:)
You could try DOC++ but it may be even uglier.
There is an open source alternative to doxygen out there ...