Dungeons & Dragons will release its System Reference Document (SRD) for its revised 5th edition ruleset next week, providing third-party creators with the frameworks for building out their own D&D-compatible content. The new SRD will be released under a Creative Commons license, meaning that anyone can use the rules provided to make their own compatible material. This new SRD sets up third-party creators for making new subclasses, spells, and other player-facing content, as well as content like adventures and monsters for DMs. The new SRD will officially be released on April 22nd.

Source: D&D Beyond