Below is a list of free helpful resources. If there are any others that you know of, feel free to post them!
- Google Docs
- Easy to download docs as PDFs.
- Scribus
- Free (and open source) desktop publishing software.
- Sejda
- Online PDF editor.
- Writer, the Internet Typewriter
- Minimal (text-only) writing tool that exports to PDF.
- AnyDice
- Online dice-rolling calculator.
- Google's Dice-Roller
- Quick, minimal dice-roller.
- Hemingway Editor
- Online text editor that critiques grammar and word choice. Provides feedback on "readability" of text.
- RPGdesign Stock Art List
- Reddit list of stock art images (specifically for RPGs).
- British Library Flickr
- Collection of public domain images that can make for good RPG art.
- Open Access Met Art
- Collection of CC0 images from The Metropolitan Museum of Art.
- Roll20
- Virtual tabletop that can be used for playing/testing RPGs with online groups.
- Roll20's List of Mapmaking Tools
- A large list of links to various map-making tools (some free, some not).
- Font Library
- A resource for fonts under Creative Commons.
- Google Fonts
- An "intuitive and robust collection of open source designer web fonts."