Trine Classic Collection is currently free on Epic Games, includes four games. https://store.epicgames.com/en-US/bundles/trine-classic-collection

In case you didn't catch it down below, The Callisto Protocol is currently free on Epic Games https://store.epicgames.com/en-US/p/the-callisto-protocol

Paradise Killer Free on Epic Games: https://store.epicgames.com/en-US/p/paradise-killer-c3ea1c