µFeed

uFeed is a micro RSS feed parser for POSIX. uFeed has no networking, no display capabilities, and does no string manipulation. It extracts meaningful information from a RSS stream into TSV format for convenient use by other programs.

Example: Open NASA's photo of the day:
$ curl -s https://www.nasa.gov/feeds/iotd-feed/ | ufeed | dmenu | cut -f2 | xargs firefox

SSRS

Simple Spaced Repetition Software (SSRS) provides a unified spaced repetition interface. SSRS can be used either through the single header file or provided CLI.