Flexi-streams is an implementation of "virtual" bivalent streams that can be layered atop real binary or bivalent streams and that can be used to read and write character data in various single- or multi-octet encodings which can be changed on the fly. It also supplies in-memory binary streams which are similar to string streams.
Documentation at https://melpa.org/#/flexoki-themes
Flexoki themes is a pair of light and dark themes for GNU Emacs based on the Flexoki colour scheme by Steph Ango.
Documentation at https://melpa.org/#/ido-flex-with-migemo
Latino sine Flexione (or Interlingua) is a language constructed by Giuseppe Peano at the beginning of the last century. This simplified Latin is designed to be an instrument for international cooperation, especially in the academic sphere. This package provides the necessary translations to use the language within a LaTeX document. It also imports fontenc in order to be able to use ligatures and quotation marks. Finally, it offers a text in Interlingua that can be used as a dummy text: Fundamento de intelligentia.
DateTime::Format::Flexible attempts to take any string you give it and parse it into a DateTime object.