I’d recommend taking a look at SolidJS. It’s been getting a lot of buzz lately (e.g. JavaScript Open Source Awards just gave it “Breakthrough of the Year”), and it’s reactivity system feels very much like Meteor’s Tracker (indeed, they can be integrated directly). It’s by far my preferred front-end framework. I’ve built a Meteor package and related libraries to integrate Solid + Meteor easily, but still need to make a starter template; meanwhile you can look at this demo.