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...Harbour project
https://harbour.github.io/
Docs about ANTLR:
https://tomassetti.me/antlr-mega-tutorial
http://www.xfront.com/ANTLR/
about v.3:
http://www.r-5.org/files/books/computers/compilers/writing/Terence_Parr-The_Definitive_ANTLR_Reference-EN.pdf
about v.4:
https://pragprog.com/book/tpantlr2/the-definitive-antlr-4-reference
and help here
https://groups.google.com/forum/#!topic/antlr-discussion