As vezes a gente pensa que tem pouca gente ou pouca coisa a respeito de Harbour, mas pesquisando aparece :
https://github.com/rjopek/harbour-list
https://github.com/rjopek/games
https://github.com/Petewg/harbour-core/wiki/MultiThreading
https://github.com/Petewg/harbour-core/wiki/HBWIN
https://github.com/Petewg/harbour-core/wiki/Harbour-INET-API
https://github.com/Petewg/harbour-core/wiki/Harbour-Socket-API
https://github.com/Petewg/harbour-core/wiki/Make-tools
Explorando os links tem muito mais informação !