HOG/IHOG
Lost Secrets: Bermuda Triangle
Magic Encyclopedia: First Story
Mortimer Beckett and the Time Paradox
Mushroom Age
Mystery of the Crystal Portal
Mystery of Unicorn Castle
Pirateville
Return to Ravenhearst
Samantha Swift and the Hidden Roses of Athena
Treasure Seekers: Visions of Gold
"Adventure Lite"
Azada Ancient Magic
Dream Chronicles 1
Dream Chronicles 2
Nancy Drew Dossier: Lights, Camera, Curses
Sherlock Holmes: Mystery of the Persian Carpet
Match 3
Bejeweled 2
Puzzle
Azada
Boxworld (I've had this version of Sokoban for years, and still go back and play it once in a while)
Gemsweeper
kmahjongg (comes free with Linux -- the version I learned on, and I still like the default tileset)
Kyodai Mahjongg (amazing tilesets)
Nahan: The Ultimate 3D Puzzle Game
Rhiannon's RhealmRooms: The Main Building
Venice Mystery
World Mosaics