From The maemo site To add new repositories to your 770 running the 2006 OS, select Tools > Application Manager, then hit the title bar or menu key, select Tools > Application catalog… and away you go.
Maemo Mapper Home Page: http://gnuite.com:8080/nokia770/maemo-mapper/ Author: John Costigan Status: Working Maemo Garage Page: https://garage.maemo.org/projects/maemo-mapper/ Downloads: https://garage.maemo.org/frs/?group_id=29 Repository: http://repository.maemo.org/extras Distribution: mistral Component: free
Repository: http://repository.maemo.org/extras Distribution: mistral Component: free