The project is an independent cross-platform open-source implementation of a virtual machine that executes scripts written in BSL (1C:Enterprise scripting language).
Script execution doesn't use any 1C:Enterprise system libraries and doesn't require installation of 1C:Enterprise system on the target machine.
In other words, this is a possibility to write programs in the 1C (BSL) language without using the 1C:Enterprise platform.
The project is called OneScript, can be abbreviated to the title 1Script on writing.
Basic information about the project, releases and technical documentation are located on the official website.
The OneScript package already includes a set of commonly used packages.