Grargar: Betrayal in Antara was added for free to anyone that owned
Betrayal at Krondor. The game's price remained the same.
Catacombs Pack was initially missing the very first game of the series,
but it was added later for free. The game's price remained the same.
Dangerous Dave in the Deserted Pirate's Hideout
was added to the <span class="bold">Dangerous Dave Pack post-release for free</span>. The game's price remained the same.
Desktop Dungeons received the Enhanced Edition treatment on April 21st, 2015. More info about what it added to the game can be found
here. The price remained the same.
The HD version of
Oddworld: Stranger's Wrath was added for free to all existing owners of the original on
November 26th, 2012. The price remained the same and new buyers have access to both versions.
Victor Vran also received some free stuff like a new dungeon, weapon, outfit and new difficulties, though not sure on which dates each of them. The price remained the same.