- Technical Sci-Fi. A blog series with advice on making astronaut missions.
- NASA Image and Video Library. Browsable database of free-to-use images from NASA.
- Itch Game Page Image Guide & Template by Star West - Helps you create itch.io project pages and properly-sized images for them.
- 100 Sci-Fi RPG Faces by GatlingArt. 100 free, Creative Commons 4.0 portraits (can be used commercially).
- 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.
- Letter TTRPG Pamphlet Template by me - Free template in Google Docs for letter-sized pamphlets. A4 TTRPG Pamphlet Template by Hugh Lashbrooke - Free templates in Google Docs, Canva, and Microsoft Word.
- WTF Pamphlet RPG Template by Wizardthieffighter. Free pamphlet template for Affinity Publisher (the pay-once alternative to Adobe InDesign).
- 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.