Time Pressure, by Spider Robinson. 1st HC/DJ
The Ring, by Piers Anthony and Robert E Margroff
The Time Bender, by Keith Laumer
With Fate Conspire, by Mike Shupp
The Man with a Thousand Names, by A E van Vogt
The Wizard of Linn, by A E van Vogt
The Patchwork Girl, by Larry Niven
The Light that Never Was, by Lloyd Biggle Jr
There Will be War 3, created by Jerry Pournelle. Blood and Iron
The War Against the Rull, by A E van Vogt
The Wizard of Anharitte, by Colin Kapp
The Ring of Ritornel, by Charles L Harness
This is the Way the World Begins, by J T McIntosh
Tides of Light, by Gregory Benford
The World Menders, by Lloyd Biggle Jr
The Wrong End of Time, by John Brunner
Vigilant, by James Alan Gardner
The Loafers of Refuge, by Joseph Green
The Red Tape War, Jack L Chalker, Mike Resnick, George Alec Effinger
Time and Stars, by Poul Anderson
The Testament of Andros, by James Blish
The Mocking Program, by Alan Dean Foster
The Longest Way Home, by Robert Silverberg
War Worlds IV, created by Jerry Pournelle. Invasion
