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Inferno (~6 years old) uses a VDOM, just like React, but it completely smokes React in benchmarks
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Preact (~7 years old) packs most of React's functionality into an exceptionally tiny package, even when including the (optional) compatibility with React components
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Svelte (~6 years old) takes the ergonomics of writing modern apps to another level, with its focus on developer experience (less LoC + far easier to reason about)
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.