There’s also The Gorn Crisis which was referenced in several novels I believe.
My intent was to count comics that had been intended all along to be in the novel continuity rather than folded into it after the fact, but in that case I probably shouldn't have counted
Perchance to Dream. If we're going there, then
Klingons: Blood Will Tell also counts, since it's been referenced in some of the novels.
And if you consider the origin of Pava from the Titan novels in the Starfleet Academy comic, then you get dozens of Marvel era comics all sharing references to one another.
Sharing a character isn't necessarily the same thing as sharing continuity, since there can be different versions of the same character (e.g. Harley Quinn or Phil Coulson). The Pava in
Titan is based on the one in SA, but there are differences (for instance, her name is changed to fit the novels' Andorian naming convention).
A few other comics-original characters have also made the transition to novels, like DS9's Etana Kol and Krissten Richter.
@Christopher what is the Lit link to the Jellico comic? I may have never read that one.
On second thought, I'm not sure there is an explicit link. Memory Beta says that the "Lieutenant Honigsberg" who appears in it as an engineer is the same character as the Alexander Honigsberg referenced as
Voyager's original chief engineer in a couple of KRAD's prose works, and reputedly in the
Caretaker novelization, though that might be a case of Memory Beta conflating a named character in KRAD's works with a nameless one in the novelization. But the character is a gender-swapped Tuckerization of a friend of Keith's, so it might not have been intended to be the same person in-universe. Only Keith could say for sure.
More tangentially, IDW adopted the Myriad Universe banner to release an alternate reality TNG series, The Last Generation.
Although it didn't quite fit with the prose
Myriad Universes works ("myriad" means "uncountably many," so it's very, very plural), since those were spontaneously occurring alternate realities while the comic was one created by time travel.