If you find any resources on your own, share them here! Here are some I’ve found over the years:
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Itch Game Page Image Guide & Template by Star West - Helps you create itch.io project pages and properly-sized images for them.
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Sci-fi character portraits project by Ashen Victor - 100 free, Creative Commons-NonCommercial portraits. Ashen has a second and third collection (paid) with additional portraits.
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NASA Images - The US’s National Aeronautics and Space Association has a bunch of images in the public domain. Double-check with their guidelines before using any of their images.
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OpenGameArt.org - massive repository of artwork under a variety of licenses.
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TTRPG Pamphlet Template by Hugh Lashbrooke - Free templates in Google Docs, Canva, and Microsoft Word.
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WTF Pamphlet RPG Template by Wizardthieffighter. Free pamphlet template for Affinity Publisher (the pay-once alternative to Adobe InDesign).
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Mothership Third Party Publishing Guide - If you want your submission to be Mothership-compatible, you need to fill this out and get approval. It usually takes a week, but can take longer.