Bundles IntelliJ IDEA Web help and serves it via built-in Web server for offline use.
Recent change notes
2018.2 release content update.
General usage instructions
Plugin replaces built-in JAR or Mac help (if there's any, like in IntelliJ IDEA Ultimate), or adds offline help feature if it wasn't originally there (like in IntelliJ IDEA Community). After installation it will open requested help pages in your default browser, and will serve them via IntelliJ built-in Web server from 127.0.0.1