OpenSim grids can run the standard LSL commands. On top of that, they also have additional functionality through the OpenSimulator Scripting Language (OSSL). For example, OpenSim-specific commands can force teleports, which is useful for building walk-through teleport gates or weapons that immediately send someone to a virtual hell when they’re hit. There is also a number of commands for creating and managing non-player characters (NPCs) and to put text and graphics on a prim.

Read the full article on https://www.hypergridbusiness.com/2018/03/new-lsl-editor-released/

The Windows based software can be downloaded at the Source Forge page and the manual is available from this Google Doc page.