Codex is a Roblox script executor that organizes work around a workspace view: scripts, snippets and notes sit in a side panel next to the editor so reusable code can be kept without leaving the application.
It supports attaching to more than one running client instance when several Roblox windows are open, and the active target is selected from a dropdown. A snippet manager stores short code fragments that can be inserted into any script with a double click.
Windows 10/11 x64, Roblox client