Frankenstein 2018

To celebrate the 200th anniversary of the publication of Mary Shelley's Frankenstein, an important milestone in both horror and science fiction, 2018 will be the year of Frankenstein, both the doctor and monster.

First, a quick checklist of derivative novels through the 1970s (not including children's and parody works).

Most of these are continuations of the original, with the primary difference being whether the creature is smart like the book or dumb like the movie.

Series by Jean-Claude Carrière, published in France.  The first two have been translated into English. 
1957 La Tour de Frankenstein (The Tower of Frankenstein)
1957 Le Pas de Frankenstein (The Step of Frankenstein)
1957 La Nuit de Frankenstein (The Night of Frankenstein)
1957 Le Sceau de Frankenstein (The Seal of Frankenstein)
1958 Frankenstein Rôde (Frankenstein Prowls)
1959 La Cave de Frankenstein (The Cellar of Frankenstein)

Series by Donald Glut, the first three or so originally published in Spain, the first four titles were released in English in 1977, with all the titles in German around 1976-7, all finally released in English in late 2017.
Frankenstein Lives Again
Terror of Frankenstein
Bones of Frankenstein
Frankenstein Meets Dracula
Frankenstein vs. the Werewolf
Frankenstein in the Lost World
Frankenstein in the Mummy’s Tomb
The Return of Frankenstein
Frankenstein and the Curse of Dr. Jekyll
Frankenstein and the Evil of Dracula

1972 Frankenstein Wheel by Paul W. Fairman

1974 Frankenstein Unbound by Brian Aldiss

1975 Cross of Frankenstein by Robert J. Meyers

1976 Slave of Frankenstein by Robert J. Meyers

1977 Hound of Frankenstein by Peter Tremayne

I'll add more as they're discovered.