Comics
Canva Comic Maker
Canva's Comic tool, with loads of great templates is fantastic. Start from a layout and you can drag in your graphics.
Retro Comics at ComicBookPlus
A wonderful collection of older strips, many of which are public domain.
For fun, you might, control(mac) or alt(click) to save them to your computer and edit them with Pixlr to add your own words.
