Foundation's Friends, an anthology edited by Martin Greenberg, is a good collection of stories by various authors based on Asimov's works.
Psychohistorical Crisis by Donald Kingsbury is a very interesting take on Asimov's Foundation idea.
Code of the Lifemaker by James P. Hogan
Pretty much anything by Timothy Zahn:
Manta's Gift
Anglemass
Icarus Hunt
Triplet (kind of a mix of fantasy and sci-fi)
Warhorse
Deadman Switch
Cascade Point (anthology)
Distant Friends (anthology)
Time Bomb (anthology)
I especially recommend the anthologies. If you like those, you'll like his full-length novels.
Psychohistorical Crisis by Donald Kingsbury is a very interesting take on Asimov's Foundation idea.
Code of the Lifemaker by James P. Hogan
Pretty much anything by Timothy Zahn:
Manta's Gift
Anglemass
Icarus Hunt
Triplet (kind of a mix of fantasy and sci-fi)
Warhorse
Deadman Switch
Cascade Point (anthology)
Distant Friends (anthology)
Time Bomb (anthology)
I especially recommend the anthologies. If you like those, you'll like his full-length novels.