Perl
Perl is a scripting programming language created in 1987. The Perl interpreter can be downloaded from https://www.perl.org/.
The following Go programs have been written in Perl.
- Detect faulty tsumego - "looks through all the sgf files in a directory and prints out a list of those where the first move and the last move are different colours"
- Games::Go::Image2SGF CPAN module - "uses image recognition to create SGF diagrams from photographs of a go board"
- Games-Go-Sgf2Dg - "a Perl distribution for the conversion of SGF files into ASCII, MetaPost, PDF, PostScript, TeX, and Sensei's Library format"
- inforenamer.pl - "renames sgf files according to the contents of the tag(s) it is given"
- removeTag - "removes any sgf properties you don't want"