Friends! In case you didn’t know it, there’s an awesome volunteer-run website called https://open5e.com/ that includes tons of OGL-released 5e material. If you’re looking for a quick spell or monster lookup, this is your place. If you’re developing a system of your own, you can access the data there through an API in a structured format. It includes the 5e SRD, a lot of material from Level Up Advanced 5e (including all of their awesome monsters), it includes all four Kobold Press monster books and we’re already working on the new Tome of Beasts 1 2023 edition. It has backgrounds and subclasses from Tome of Heroes. It’s just packed with awesome stuff.
You’ll always get better descriptions, art, and design from the books themselves but if you’re looking to link to 5e material, this is the site for you.
If you like what you see there and want to help out, there are lots of ways you can do so. Join the Open 5e Discord server, introduce yourself, and jump on in!