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.
Autocrypt is a set of guidelines for developers to achieve convenient end-to-end-encryption of e-mails. It specifies how e-mail programs negotiate encryption capabilities using regular e-mails.
For users, Autocrypt Level 1 offers single-click, opt-in encryption, eases encrypted group communications, and provides a way to setup encryption on multiple devices.
Defines a standard, programming language agnostic interface description for REST APIs, which allows both humans and computers to discover and understand the capabilities of a service without requiring access to source code, additional documentation, or inspection of network traffic. When properly defined via OpenAPI, a consumer can understand and interact with the remote service with a minimal amount of implementation logic. Aims to remove guesswork in calling a service.
The wikipedia page about how XMLHttpRequest works. This seems like a pretty straightforward description of the standard. exocortex unmark