I recently needed to see how some things are scripted in Second Life™. I went looking for an existing script similar to what I need. I came up with these sources for free Second Life scripts.
Free LSL Scripts – This site’s domain was obviously selected for search placement: Free-SL-Scripts.com. The blog style site, once you get to the free scripts page, shows popular, recent, and after scrolling down categories of scripts. This is a great site for beginning scripters, IMO.
The site includes a great collection of tutorials on all sorts of things related to SL.
They have an in-world shop too: Phaze Demesnes.
SL Wiki Script Library – This is the script library maintained by users on the SL Wiki. It is a good collection of scripts. Some are old. A few are new.
SL Forum Scripting Section – This is the SL Forum section on scripting. It is hard to use for finding scripts but a great place for help.
Chimera Fire Free Scripts – This site has a small collection of handy scripts. It also has a list of other script sources.
SLUniverse – This forum based library is a bit awkward to use, but there is a good collection of scripts. Plus there are people there that may help you with them, if you are lucky.
Foxsan’s 3D Tools And LSL Script Repository – A small collection of scripts and 3D tools. Most of the site is shutdown because the owner can’t handle the spam.
College of Scripting – In-world. This is an interesting approach to scripting. Plus they get into some philosophy, which makes them heroes in my thinking.
Builders Brewery – In-world. This is an excellent all around educational group for scripting and building. The site has lots of interesting full perm stuff to check out.