Some free-to-play games were "given away" with some extra bundled in:
- World of Warships: Starter Edition
- Paladins: Epic Pack
- Rogue Company: Season Four Epic Pack
- Antstream: Epic Welcome Pack
- Dauntless: Epic Slayer Kit
- Rumbleverse: Boom Boxer Content Pack
- Destiny 2: Bungie 30th Anniversary Pack
- Realm Royale Reforged: Epic Launch Bundle

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There's another regularly updated list by @Goldude. If a game has been given away multiple times, they put it on the list multiple times instead of just mentioning it in the notes. They also put the actual version that was given away instead of breaking it down to the base game. (eg.: Borderlands: The Handsome Collection instead of listing each base game from the Handsome Collection.) Furthermore, they also include the F2P game bundles in the actual list. Depending on your preference, you might wanna look at that list instead.
https://www.backloggd.com/u/Goldude/list/epic-games-free/user/grid/