How to use the RTC alarm function.

Overview of current (2018-10) compression algorithms.

Coccinelle is a program matching and transformation engine which provides the language SmPL (Semantic Patch Language) for specifying desired matches and transformations in C code. Coccinelle was initially targeted towards performing collateral evolutions in Linux. Such evolutions comprise the changes that are needed in client code in response to evolutions in library APIs, and may include modifications such as renaming a function, adding a function argument whose value is somehow context-dependent, and reorganizing a data structure. Beyond collateral evolutions, Coccinelle is successfully used (by us and others) for finding and fixing bugs in systems code.

Minifree provides secure, privacy-respecting computers with 100% free (as in freedom) software, including the Libreboot BIOS replacement and GNU+Linux operating system, certified by FSF under their Respects Your Freedom certification program.

Explanations and code for how to enable copy-paste support working in as many terminal applications as possible. Works on a full GUI $DISPLAY, over SSH, on both macOS and Linux, and between ZSH, tmux and Emacs.

Installing the Guix package manager on Android, requires root access.
Note that "Guix complains when /gnu or /gnu/store is a symlink".

chrony is a versatile implementation of the Network Time Protocol (NTP). It can synchronise the system clock with NTP servers, reference clocks (e.g. GPS receiver), and manual input using wristwatch and keyboard. It can also operate as an NTPv4 (RFC 5905) server and peer to provide a time service to other computers in the network.

Linux man pages

Skywave Linux is a 64 bit system, built on a base of Ubuntu 16.04 LTS, uses the MATE desktop environment, and draws on the capabilities of Ubuntu: software updating, graphics, system resource management, etc. It is the additional digital signal processing, networking, and signal decoding applications that set Skywave Linux apart from stock Ubuntu Linux. The default username is skywave and there is no password in the default system.

See also the comments warning against it.