Scripts, for a wide variety of popular sites, are available on the internet, the User Script Hosting page on the Greasemonkey wiki contains a list of sites that host scripts. Unfortunately the User Scripts site listed on the page which has been in the past the most popular script hosting site, and contained most of the Geocaching related scripts, is not accessible at this time (30 May 2014) via the links to it that are posted through out the Greasemonkey site and on the Greasemonkey add-on page in the Firefox browser (it has been unreachable since before 14 Apr 2014). It is however available via the following link: http://userscripts.org:8080/.
If you're the tinkerer sort or have programming skills, you can also write your own, see the Greasemonkey wiki to get started.
I would like to recommend a great greasemonkey script for the geocaching.com website that I recently came across.
It is GC little helper (http://userscripts.org/scripts/show/81052) by Torsten Amshove
It has long list of capabilities which enhance the cache pages and other pages at gc.com. I have seen requests for many of these capabilities in the
feedback forum. Here a few the capabilities:
I highly recommend this script even if you are not yet a greasemonkey user.