When comparing Femto Emacs vs Textadept, the Slant community recommends Textadept for most people. In the question“What are the best open-source text editors for programming?” Textadept is ranked 9th while Femto Emacs is ranked 37th. The most important reason people chose Textadept is:
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.
Specs
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Pros
Pro Well documented
A long and well written tutorial teaches how to program in femtolisp and write extensions for Femto Emacs.
Pro Highly compatible with Emacs
If you know Emacs, you can start using Femto Emacs immediately.
Pro Very small footprint
The size of the executable file and the femtolisp library add up to only 500 k. The C source code is also small and well documented, so one can easily modify it. You can also use the source code to learn how to program a text editor.
Pro Very fast startup time
For small files, Femto Emacs starts up faster than emacs or vim.
Pro Has both GUI and TUI
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.
Pro Cross-platform
It's available for Windows, Mac and Linux.
Pro Small and portable
Has very few dependencies, and very small footprint. Can be copied to a new system in a moment, unpacked and be at your service.
Pro Scriptable
Has a built-in lua engine.
Cons
Con No syntax coloring for Latex
The distribution comes with syntax coloring examples for many languages, like Haskell, C, Lisp, Python, etc. However, there is no scheme for Latex. If you need syntax coloring for Latex, you will need to add your own color scheme.
Con Source distribution only
Femto Emacs is distributed only in source form. Therefore, you need to install ncurses, gcc and compile it with make and make install. There is no binary distribution. If you want mouse support, you need to program it in femtolisp or in C. This should not be a problem if you are a programmer, but can become an issue if you don't know Lisp or C. If you want to use femtolisp on Windows, you will need mingw and ncurses.
Con Community
Does not have an IRC channel or some kind of forum where a community of developers/plugin writers could evolve around. Has a mailing list which is said to be active but that does not feel that attractive.