Monocypher is a cryptographic library. It provides functions for authenticated encryption, hashing, password hashing and key derivation, key exchange, and public key signatures.

Unison is a file-synchronization tool for POSIX-compliant systems (e.g. BSDs, GNU/Linux, macOS) and Windows. It allows two replicas of a collection of files and directories to be stored on different hosts (or different disks on the same host), modified separately, and then brought up to date by propagating the changes in each replica to the other.

(Also, this link uses html-preview.github.io, which seems to be a useful service in itself.)

The Python interpreter has a number of functions and types built into it that are always available.

If what I'm looking for isn't here, it's probably in itertools.

Built-in Types

The following sections describe the standard types that are built into the interpreter.

The principal built-in types are numerics, sequences, mappings, classes, instances and exceptions.

The documentation for the re module. Since the re can be replaced with any module name, it's a useful springboard.

Scribus Python interface module

This module is the Python interface for Scribus. It provides functions to control scribus and to manipulate objects on the canvas.