JOE is described as 'full featured terminal-based screen editor which is distributed under the GNU General Public License (GPL). JOE has been around since 1988 and comes standard with many Linux distributions' and is an app in the OS & Utilities category. There are more than 50 alternatives to JOE for a variety of platforms, including Windows, Linux, Mac, BSD and Chrome OS. The best alternative is Visual Studio Code, which is free. Other great apps like JOE are Notepad++ (Free, Open Source), Atom (Free, Open Source), Vim (Free, Open Source) and VSCodium (Free, Open Source).
CudaText is a cross-platform text editor, written in Lazarus. It starts quite fast (0.5 sec with ~30 plugins on CPU Intel Core i3 3Hz). It is extensible by Python add-ons (plugins, linters, code tree parsers, external tools).