Contact
Mailing list
There exists a mailing list for libosmscout at sourceforge. The mailing list is low traffic, but you can still reach the main developers there.
You can find instructions to subscribe to the mailing list here.
Note that you must first subscribe to the list. If you send mails to the list before being subscribed you either have to wait for the maintainer to pass them through (which may take a while) or they will never appear on the list at all.
You can find a searchable archive of the mailing list here.
Matrix
There is a public matrix room at #libosmscout.matrix.org
. While
it is a chat room, answer may take some time.
Else
If everything else fails you can contact Tim Teulings for more information.