(There's no video for BBEdit Lite 6.x yet. Please contribute to MR and add a video now!)
BBEdit Lite is an advance text and source (html, programming, TeX... ) editor.
It was the defacto standard text editor on the Mac (besides the fact it was more or less the only good raw text editor for the mac). It is a "raw" editor ("Bare Bone Editor", hence the name) without any formatting so it is great for source code, html...
This is the free version. It has some limitations, but for the most uses a classic Mac might have today, I think it is perfect.
(4.54 MiB / 4.76 MB)
System 7.0 - 7.6 - Mac OS X / Binary encoded, use Stuffit Expander
Emulating this? It could probably run under: SheepShaver