Contents:

• engines: list of JavaScript engines
• parsers: list of JavaScript parsers
• app: SPA app for zoo.js.org
• bench: benchmarking different engines on V8's test suite
• build: docker/make-based build system for open-source engines (base build scripts and containers)
• harness: testing harness for test262/benchmarking
• conformance: ECMAScript conformance test suites

See zoo.js.org for the main tabular view with benchmark and conformance scores, or perhaps engines.json for a machine-readable json with structured data.

Most engines come with a build script. Build and play around with any engine locally (needs docker, podman or Apple's container):

• cd engines/<name>/ && make
• cd engines/<name>/ && make sh - explore the build container (build artifacts will be in /dist)
• DOCKER_ARCH=riscv64 make sh - cross build with qemu (sudo apt install qemu-user-static)
• REPO=https://... REV=<commit/branch/tag> make - build from a specific commit and/or repo

You can download pre-built binaries from GitHub releases or play with them using this Docker Hub image:

• docker run -it ivankra/javascript-zoo
• podman run -it docker.io/ivankra/javascript-zoo
• container run -it docker.io/ivankra/javascript-zoo

• Allen Wirfs-Brock and Brendan Eich (2020). JavaScript: the first 20 years.
• Other JavaScript engines compendiums: wikipedia, bkil, linusg, ahaoboy, eatonphil.com, buttondown.com, guest271314, bga, JsUnit (early 2000s JavaScript landscape), thaliaarchi (regex engines)
• esvu / jsvu - installers for official releases of various engines
• test262.fyi - daily test262 runs for recent engines