Sucuri SiteCheck- Free Website Malware and Security Scanner, QuirkTools - Screenfly responsive screen testing and others, SumoMe - Tools to Grow Your Website’s Traffic,Hootsuite - social media integration, Copyscape - check content for duplicates, and plagiarism,PubDB - Tools: website traffic, database of AdSense/ google-analytics publisher ids, website IP address related details, SurveyMonkey - Create online surveys, Wufoo.com - Build online forms; Xqt2 - Make encrypted web pages; Wave @ Webaim: website accessibility evaluation tool; SMMRY - automatic summary generator;
Google autocomplete for US states.
The Rasterbator - Make your own poster
Quant - No tracking European search engine.
sassafras4u.com - Interesting site with bookmarks to science articles. But still not sure who is archiving those links.