This is a text editor that, long ago, was available for the Atari ST.
It has a really remarkable user interface that can really only be explained by demonstration.
Ditch everything you know about word processing and text editors before you sit down with Sudden View. It's, well, shocking. Words fail to accurately describe it.
|-- John Nagy|
A somewhat less elderly version is available for Windows95; it unfortunately doesn't work under WINE .
a very simple, fast, powerful, small, low cpu consumption, highly configurable text editor for text terminals and X.
Outliners - Hierarchical Editors
Fe is a "folding editor" descended from Origami.
Eastern Orthodox Editors - those based on IBM XEDIT
This was originally ZDE, a CP/M and ZCPR-based "clone" of WordStar. It has been rewritten in x86 assembler for use with MS-DOS and its friends. A fast, small, and fairly powerful text editor.
QED is a predecessor to ed and vi, one of the first to use regular expressions.
It lies somewhat in between vi and Emacs in that its commands more resemble those of vi (which is essentially a successor), but where, like Emacs, it supports having multiple buffers in memory. Going beyond both, in terms of "computing power", it offers the capability to have commands that operate on sets of buffers (hence operating on multiple files) all at once.
Historically, it should probably be particularly contrasted with TECO .
They are roughly contemporary
The first version of Emacs was created as a set of TECO macros, so there is a whole set of similar editors down that path.
In contrast, QED had, as successors, Unix-related editors such as ed, sed, vi, sam, acme.
There are likely, today, vanishingly tiny sets (possibly null) of programmers still using TECO and QED, but both editors have been hugely influential (despite being fairly ill-known in modern times).
An incomplete history of the QED Text Editor by Dennis Ritchie
QED Archive - archive of source code of various versions of QED.
Collected as a result of discussions on TUHS
CTS QED source code
This was derived from USENIX tape 80.1, and patched (a bit) to build on modern Linux. This is probably the easiest QED to get running.
This Plan 9-sourced text editor has a similar operating model, and is arguably a successor. (I believe that Kernighan and Pike both consider it to be the successor that they use, which ought to be a pretty decent argument in this regard...
Ed is a simplification of qed, notably in that it does not support having multiple buffers.
If you need to edit files of simply enormous size, and can afford the notion of not having an "interactive" editor, sed provides a quite ferociously fast option. It works via making one pass across the input, which may run numerous edit transformations, which is very efficient.