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This is a GREAT free/libre webcomic (and good for kids; my son loves it). Also a big bonus: produced with all-FOSS tools!
https://www.peppercarrot.com/
Any other suggestions for kid-appropriate Web comics?
@meejah what age group? http://www.sssscomic.com/ deals with post apocalyptic scandinavian but is generally upbeat, can be scary if it's a small child, but I'd say like 12plus? Harry potter is more scary.
@Corvusheart This one is good too: http://www.drewweing.com/comic/chapter-1-city-of-monsters/
(not free/open but a compelling story)
@Corvusheart Currently 8-plus, but time marches on (and both kids have read up to book 3 of Harry Potter). Thanks!