The yaff format has the following design aims:
Human-friendly. Truly human-readable and human-editable. For example, BDF and XML claim to be human-readable formats, but let's not kid ourselves. Human-friendly means plain text, flat, immediately visualised, easy on the eye, and light and obvious syntax. We should avoid duplication of information, unless it is of obvious use to a human user.
Able to represent fixed-width and proportional fonts.
Preserves comments, metadata and metrics. Formats such as BDF contain a wealth of metadata such as names, acknowledgements and style specification, but also font metrics that affect the way the font is displayed. The yaff format should preserve these.
Able to represent Unicode fonts as well as codepage fonts.
AMB stands for "Ancient Machine Book". It is an extremely lightweight file format meant to store any kind of hypertext documentation that may be comfortably viewed even on the most ancient PCs: technical manuals, books, etc. Think of it as a retro equivalent of a *.CHM help file.
This web page holds the format specification, as well as reference tools to work with the format: AMB (the reader) and AMBPACK (archive packer/unpacker). All tools are published under the terms of the MIT license.
There are loads of RSS feed-building services out there, and I'm sure they do the job just fine. But when it comes to this website, I like taking the amateur DIY route as much as I can.
Three traditional BBS-circulated documents about the QWK format, based on reverse engineering; the official spec, excerpted from the documentation of 1stReader; and the official QWKE specification, all re-formatted with Markdown. Although I consider some of this material to be inaccurate, I’ve tried to avoid editing for content, except to remove references to web sites, boards and addresses that are no longer working.
A double-entry bookkeeping computer language that lets you define financial transaction records in a text file, read them in memory, generate a variety of reports from them, and provides a web interface. In theory, if it can read a text file, it can manipulate your accounting "database." More of a standard or file format than an application because you can do it all in a text editor if you really want.
The reference implementation is written in Python and seems to have a webapp.
The more-or-less official file format for offline reading of Wikipedia. The full byte-by-byte description of ZIM archives can be found here. There is also a zimlib-git AUR package for Arch Linux.