Miscellaneous

Online TCGs

Rizu's Scripts	Archive of a page with useful PHP and JS scripts
Find Duplicate List Items	Finds duplicates in your card pile, if the TCG you play has a duplicate exchange.
Caitlin's TCG Scripts	A bunch of useful scripts and mods for TCGs. Aimed at Idolize, but many are easy to adapt.

Tools

Line Sticker Ripper	A Script to rip Line stickers, even outside of your region.
Cobalt	Media downloader for assorted sites.
Cipher Tools	Information on assorted ciphers alongside web-based tools to put them into practice.
Dead Link Checker	As it says on the tin. Seems to be free if you only want to check manually?
HTML Cleaner	Runs assorted bulk actions on a provided snippet of HTML code. Includes stripping inline styles.

Misc.

"Search Enginges With Their Own Indexes"	Blog post outlining the available distinct search engines.
Mindat	"Mindat.org is the world's largest open database of minerals, rocks, meteorites and the localities they come from."