Post-
Voyager, there's the following novels:
Homecoming by Christie Golden
The Farther Shore by Christie Golden
Spirit Walk: Old Wounds by Christie Golden
Spirit Walk: Enemy of My Enemy by Christie Golden
Full Circle by Kirsten Beyer
For the year leading up to
Nemesis on the
Enterprise-E (with Janeway in a supporting role as an admiral), there's the "A Time to..." series:
A Time to Be Born by John Vornholt
A Time to Die by John Vornholt
A Time to Sow by Dayton Ward & Kevin Dilmore
A Time to Harvest by Dayton Ward & Kevin Dilmore
A Time to Love by Robert Greenberger
A Time to Hate by Robert Greenberger
A Time to Kill by David Mack
A Time to Heal by David Mack
A Time for War, a Time for Peace by Keith R.A. DeCandido
Then after
Nemesis, you've got the
Titan series and the
TNG series, which branch back together for the
Destiny trilogy, then go their separate ways again. Here they are, plus some other not-in-a-specific-series books, listed in rough chronological order:
TNG: Death in Winter by Michael Jan Friedman
Titan: Taking Wing by Michael A. Martin & Andy Mangels
Titan: The Red King by Andy Mangels & Michael A. Martin
Articles of the Federation by Keith R.A. DeCandido
TNG: Resistance by J.M. Dillard
TNG: Q & A by Keith R.A. DeCandido
TNG: Before Dishonor by Peter David
Titan: Orion's Hounds by Christopher L. Bennett
Titan: Sword of Damocles by Geoffrey Thorne
TNG: Greater than the Sum by Christopher L. Bennett
Destiny: Gods of Night by David Mack
Destiny: Mere Mortals by David Mack
Destiny: Lost Souls by David Mack
A Singular Destiny by Keith R.A. DeCandido
Titan: Over a Torrent Sea by Christopher L. Bennett
TNG: Losing the Peace by William Leisner (coming in July)
Articles of the Federation chronicles a year in the life of the Federation president, deals with some of the fallout of
Nemesis, and also introduces some characters who play major supporting roles in the
Destiny storyline. The
Destiny trilogy is a crossover involving the
Enterprise and
Titan crews (and a bunch of others besides), with
A Singular Destiny being a general followup to the trilogy focusing on the galaxy as a whole.
That should get you started.