There are 3 repositories under teletext topic.
CCExtractor - Official version maintained by the core team
“Bad Apple” - The definitive BBC Micro/Teletext Version
On-line browser of Polish Teletext service Telegazeta & Gazeta TV Polsat
BBC Micro Elite… in teletext
Terminal application for reading https://yle.fi/tekstitv/txt/
Decodes teletext pages from DVB transport streams
Teletext Demo for Acorn BBC Master 128
Source code for "Teletext is not dead"
A telnet server for Swedish teletext service | En telnet-server för SVT Text TV
Masquerain is a tool to convert images into Teletext stills, as per Teletext Level 1 standard.
Functions for semigraphics similar to ABC80 (setdot, clrdot, dot), TRS-80, TeleText, Text-TV, & Viewdata using 3x2 blocks, and ZX81 (plot, unplot) using 2x2 blocks.
A python terminal program that shows the teletext of the ARD.
ttxweb - Teletext-to-HTML Generator: Generates beautiful and accessible HTML from Teletext pages (EP1 file format).
For generating real teletext with the Vbit inserter hardware. Takes a teletext stream and drives the vbit.
Progress towards reversing the Mullard SAA5050 integrated circuit die shot.
A browser-based teletext viewer from archived data of a couple of german stations.