Hi there,
14/11/2009
Updated.
As always I have NOT tested any of these links. Do so at your own risk.
Demo List
Abe's Oddysee Demo
Abe's Exoddus Demo
Alien Nations Demo
Arx Fatalis Demo - If you're having problems try the FAQ on Arkose's post
Battle Chess Demo
Beyond Divinity Demo
Beyond Good and Evil Demo
Blake Stone: Aliens of Gold Demo
Bloodrayne Demo
Bloodrayne 2 Demo
Broken Sword 2 Demo
Broken Sword 3 Demo
Capitalism 2 Demo
Capitalism Demo
Castles Demo
Celtic Kings Demo
Colin McRae Rally 2005 Demo
Conquest of the New World Demo
Darkstar One Demo
Descent Demo
Descent 2 Demo
Descent 3 Demo
Disciples 2: Dark Prophecy Demo - Best I could find.
Disciples: Sacred Land Demo
Die by the Sword Demo
Divine Divinity Demo
Duke Nukem 3D Demo
Duke Nukem: Manhatten Project Demo
Earth 2140 Demo
Earth 2160 Demo
Earthworm Jim 1&2 Demo
Earthworm Jim 3D Demo
Evil Genius Demo
Evolva Demo
Expendable Demo
F/A 18E Hornet Demo
Fallout Demo
Fallout Tactics Demo
Far Cry Demo
Feeble Files Demo - need to scroll down about a third
FlatOut Demo
Freespace Demo
Freespace 2 Demo
Ghost Master Demo
Ghost Recon Demo
Giants: Citizen Kabuto Demo
Gorky 17 (Odium) Demo
Gothic Demo
Gothic 2 Demo
Ground Control Demo
Ground Control 2 Demo
Heroes of Might and Magic 3 Demo
Hostile Waters: Antaeus Rising Demo
I.G.I 2 - Covert Strike Demo
IL-2 Sturmovik Demo
Imperial Glory Demo
In Cold Blood Demo
Incoming Demo
Incoming Forces Demo
1nsane Demo
Invictus: In The Shadow Of Olympus Demo
Iron Storm Demo
Jack Orlando
Jagged Alliance Demo
Jagged Alliance - Deadly Games Demo
Jagged Alliance 2 Demo
Judge Dredd vs Death Demo
Kingpin Demo
Knights and Merchants - The Peasants Rebellion Demo
Lionheart: Legacy of the Crusader Demo
Lords of Magic Demo
M.A.X. Demo
M.A.X. 2 Demo
MDK Demo
MDK 2 Demo
Messiah Demo
Neighbours from Hell Demo
Neighbours for Hell 2 Demo
Obscure Demo
Operation Flashpoint Demo
Original War
Painkiller Demo 1
Painkiller Demo 2
Painkiller Demo 3
Panzer Elite Dunes of War Demo
Panzer Elite Fields of Glory Demo
Patrician 3 Demo
Perimeter Demo
Port Royale Demo
Port Royale 2 Demo
Postal Demo
Postal 2 Demo
Postal 2 Multi-player
Praetorians Demo
Prince of Persia: Sands of Time Demo
Psychonauts Demo and Demo Patch
Pure Pinball Demo - I have kept this here as the Pure Pinball 2 demo is an hour trial
Pure Pinball 2.0 Trial
Rainbow Six Demo
Redneck Rampage - DosBox needed.
Republic The Revolution Demo
Rise of the Triad Demo
Runaway: A Road Adventure
Sacred Demo
Sacrifice Demo
Screamer Demo
Second Sight Demo
Sensible Soccer 2006 Demo
Septerra Core: Legacy of the Creator Demo
Seven Kingdoms 2 Demo
Seven Kingdoms: Ancient Adversaries Demo
Shattered Steel Demo
Shogo: Mobile Armour Division Demo
Simon the Sorcerer 1 and 2 - Demos are under "Adventuresoft/Horrorsoft Demos." May need ScummVM.
Soldiers: Heroes of World War 2 Demo
Spellforce Demo
Stronghold: Crusader Demo
The Guild 2 Demo - I could not find a demo for The Guild so I've put The Guild 2 demo so people can get a general idea of gameplay.
The Incredible Machine Demo
The Incredible Machine - Even More Contraptions Demo
The Longest Journey Demo
TOCA: Race Driver 3 Demo
Unreal 2 Demo
Unreal Tournament Demo
Unreal Tournament 2004
VR Soccer Demo - Requires Registration
Warlords Battlecry 3 Demo
Can't Find Demo List
Beneath a Steel Sky and Lure of the Temptress not included as are free.
Castles 2
Fallout 2
Jagged Alliance 2: Unfinished Business
Kingdom the Far Reaches
Robinson's Requiem Collection
Simon the Sorcerer 3D
Stonekeep
The Guild
Unreal
Waxworks
As before I have NOT tested any of these links. Do so at your own risk.
Karl

Anybody got a link for Heroes of Might and Magic 3 demo?

It's ZDNet.

http://www.filefront.com/1991110/Heroes-of-Might-and-Magic-III-Demo-Win/

Expendable demo.
Port Royale demo.
Incoming demo.
Incoming Forces demo.

The Longest Journey demo.

Praetorians

Imperial Glory demo

The Incredible Machine: Even More Contraptions demo here.

The Incredible Machine demo. 505kb. :D

ler buamp

Divine Divinity demo.
Beyond Divinity demo.

Was hoping for these, thanks. :D
Edit: damn, they dont work.
Beyond Divinity demo is here, cant seem to find one for DD.

Psychonauts: http://www.psychonauts.com/updates/PsychoDemo1_02.zip
(demo patch: http://www.psychonauts.com/updates/Psychonauts-v104-comprehensive.zip)

Bloodrayne and Bloodrayne 2. (The latter requires registration)

Bloodrayne 2 demo (no registration).