Textadept vs Crimson Editor

Both text and GUI versions behave mostly the same, just the way notepad users would expect it to.
Like shift+arrows - select, Ctrl+c - copy, Ctrl+o - open a file.

It's available for Windows, Mac and Linux.

You can write plugins pretty easily.

Here is the API doc, quite compact.

Here is a module which adds a support for ctags.

Has very few dependencies, and very small footprint. Can be copied to a new system in a moment, unpacked and be at your service.

Has a built-in lua engine.

It can create a project that will be stored in a prj file, which is a text file that can be edited and used across systems. The folder pane navigation is limited to each disk drive. The output pane can be used to capture compilers or other exe's output, and also shows search output while searching in multiple files. You can just click on any line and it then opens the corresponding file in a new tab and shows you the needed line.

Can open with all last worked documents - remembers all file positions.

Find and replace (multifile) allowed with support for regular expressions also.

Repetitive lines or words can be recorded as a macro, kept and recalled when needed, since it is permanently stored (up to 11 macros).

Return to last edit option is very good during coding, where we can lose track of where we were.

The column mode editing trick, which we could do in MS Office (with ALT + mouse key), is also available.

Supports any number of tabs