Adriano Cappelli – Lexicon abbreviaturarum
Probably the most famous dictionary of Latin abbreviations.
Computer versions
https://scrapbox.io/files/621897873b0ffe001d3d6e0e.png
Free offline version (for PC, MacOS, Linux and Android) prepared by Jan Odstrčilík. https://scrapbox.io/files/62161d72ca6dbb001db3deb5.png
Training software
https://scrapbox.io/files/62161e2a3091b5001d56428f.png