Browsix makes core Unix features available in web applications (including processes, pipes, signals, sockets, and a shared file system) and extends JavaScript runtimes for C, C++, Go, and Node.js programs so they can run in a Unix-like environment within the browser.

This split-panel editor uses Browsix to run programs from the TeX Live suite in the browser. When you hit the "Build PDF" button in the upper right, Browsix runs latex main.tex; bibtex main.aux; latex main.tex; latex main.tex in sequence, with each command executed as a process in its own Web Worker, to generate (or regenerate) the PDF shown below on the right. The first run takes between 15 and 30 seconds, as every class file and font needs to be downloaded (hundreds of individual files). After the files have been cached, subsequent runs complete in 6 - 15 seconds.