https://creativefyi.com/
Creative FYI — Design, typography, and visual encoding tools for developers.
Colors, fonts, emojis, symbols, and Unicode — structured data for creative workflows.
encoding toolscreativefyidesigntypography
https://www.htmlescape.net/
Text Encoding Tools for Developers - HTML, JavaScript, Java
Free developer tools for escaping and decoding text. Encode HTML entities, decode HTML, escape Java and JavaScript strings, and more.
tools for developershtml javascripttextencoding
https://lists.debian.org/debian-tex-maint/2015/11/msg00029.html
Re: Bug#805054: ITP: teckit -- Encoding conversion tools for plain text files
https://lists.debian.org/debian-tex-maint/2015/11/msg00080.html
Re: Bug#805054: ITP: teckit -- Encoding conversion tools for plain text files