Morse code learning tool released under GPL

Current version

aldo requires the following formula to be installed:
libao 1.2.2 Cross-platform Audio Library

Recent formula history

barthel aldo: add a test (#25770)
Viktor Szakats aldo: secure url(s)
Viktor Szakats aldo: use secure url (redirected to cleartext)
Viktor Szakats aldo: follow url, use https in comment
Nikolaus Wittenstein Add descriptions to all remaining homebrew packages

Formula code at GitHub