A recent message from Patrik made me wonder how many languages do have formal syntax that can be potentially described in a formal grammar (YACC/EBNF/PEG). The search in Frathwiki returned almost nothing. Of course, not all conlangers are programmers so I don't think presenting a working syntactic parser should be a requirement for accepting that a language has formal syntax. I wish there was a list of such languages. I'd like to study them more since as of now I know only two of them: 1. Loglan http://math.boisestate.edu/~holmes/loglan.org/holmes_stuff/cefli.html 2. Lojban https://github.com/Ilmen-vodhr/ilmentufa Can you add more? It'd be nice to have a list of such conlangs.