LSL-Editor

LSL Editor may or may not have feature parity with LSL Editor Community Edition. This article may be outdated.

LSL Editor Community Edition Source Forge: LSL Editor

There is an issue list at LSLEditorBugs.

LSL-Editor is a standalone Windows LSL script editor and run-time environment.

Code highlighting (including Brackets matching)
Code auto completion (Like Visual Studio)
Auto insert events
Argument information on functions (typing)
Tabbed or MDI interface
LSLWiki or SecondLife color scheme
The usual editing functions
Block commenting/uncommenting
Tooltip on keywords (LSL-Editor contains complete LSL guide!)
Auto-indent (using tabs or SecondLife indent scheme)
Help, on every keyword, uses www.LSLwiki.NET information
Compiling and execute outside SecondLife world
Breakpoints and stepping coming in a future version
llDialog input screen
Printing
You don't have to install the program, just unzip and use it. (Requires .NET 2.x.)

Windows XP , Windows 2000 , Windows 2003, probably Vista

Feature Wishlist

Inventory simulation: Would be nice if the inventory functions of LSL could be simulated by putting dummy objects into a dummy inventory. No further attributes (except maybe type) would have to be supported.
Linked prim simulation: Would be nice if an object consisting of several linked prims could be simulated. No further attributes beyond link id would have to be supported. Flags like LINK_ALL_OTHERS or LINK_ALL_CHILDREN would be nice to have.
Missing constants TEXTURE_BLANK and TEXTURE_TRANSPARENT