For an alternative for ExpanD&D for fifth edition Dungeons & Dragons check out DND: Full Fantasy by MallowMaenad. I asked the creator if it was acceptable to post it here and Mallow said it was okay.
The document has a pretty large selection of races compared to ExpanD&D, including stuff like a Gallusine race which are basically anthropomorphic chickens known for laying unfertilized eggs, an Ectoid undead race which are skeletons padded with slime that emulate fat, and the Vesyian race, a massive and incredibly fat human-like race accustomed to a VR-like fantasy plane that they lost access to and were forced to start living in the material plane. A good pile of the races are anthropomorphic animal based, like cats, bears, whales, pigs, kangaroos, and so on, which is good for furry characters. Some are based on plants, such as the Frujnn, which are based on fruits and vegetables, and all have an internal juice of some kind which they can use for a boost for either themselves or an ally, while Solata are based on plants such as trees, flowers, and mushrooms, and have a way of producing their own fruit by being inherently able to cast the Goodberry spell.
There’s some rules for playing races as a different size than what they’re described to normally be, changing to a size between Tiny and Huge. An example of what this allows is having a Sagenku - a skunk like race that’s normally Small sized - to be large sized.
Class options include a new cultist class based around various deadly sins, a collection of themed subclass options for the 13 official classes (I like the idea of the Druid Circle of the Hive the most from the list), and two prestige class options, a Lipomancer and a Magnologist.
There are some themed background suggestions such as Food Critic, Model, Giant-Blooded, Spoiled Aristocrat, and Wretch in the document. New spells such as Bolstering Blubber, Blobify, Trim Fat, Windbag, and so on are also included for spellcasters to use.
Currently the creator is working on some content for game masters/Dungeon Masters to use, such as new monsters like the Gnome Oozetender.