Welcome to the forums. You can check out the user-maintained list of games. It does not have all the games on the site but it would be a decent starting point for someone new. That or the #projects #curated-projects and #gain-jam sections will give you a good look at what the site has to offer. You can also look at a certain tag if you are know are interested in something more specific (not everything will be tagged on the site as we rely on the developers and helpful community members to help out but it can point you in the right directions) such as #visual-novel or #rpg-maker.
I’m biased towards female weight gain and visual novels so keep that in mind for my recommends. In no particular order here we go:
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Fattening Career - Just put out a free update.
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Forks: A Weight Gain Visual Novel- Game was cancelled.
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Feeder Fantasy (original Japanese version) & The modified Female MC/English translation version
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Hungry Elves with the English translation here
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Love is the Way to My Heart - The game is having a new demo release within this month for patreons, and will be free for everyone a bit after.