Yeah, the Rob2e (and company because there's a bunch of people who actually develop these extensions) extensions can be gotten through DMSGuild, here's a couple of the links:
Spell Effects: https://www.dmsguild.com/product/209...Coding--Spells
Feats: https://www.dmsguild.com/product/222...-Coding--Feats
Race Traits: https://www.dmsguild.com/product/210...g--Race-Traits
Class Features: https://www.dmsguild.com/product/210...Class-Features
Like all things, you'll have to determine how valuable these things are to your running 5e campaigns and what your budget for things are (some of these are a little pricey for some people, but there's a boatload of effort that has went into them and its paying for their time to have developed them). Also, depending on when you do things, there are sales where some of the extensions costs go down here and there, so keep that in mind as well. A lot of people, myself included, find a huge amount of value in having these already all worked out and it saves a lot of time for us, where we can concentrate on the other aspects of preparing for and running things versus trying to figure out how to automate parts of it.