TraceCode

TraceCode is one of those algorithm visualizers that shows you step-by-step execution, which honestly isn't a new category — VisuAlgo's been doing this since like 2014 and everyone has their favorite recursion tree animation memorized. But if TraceCode actually has solid interactive breakdowns for things like sorting or graph traversal that go deeper than the usual "here's bubble sort swapping numbers" demo, it could be a sleeper study tool worth bookmarking. The tagline is functional but not exactly electric, and without knowing how many algorithms it covers or whether it actually explains the runtime mechanics rather than just animating them, I'm not ready to call it essential yet.