I have been cleaning my bookmarks and I notice I have a whole set of very simple web based tools I have which I think can be of use to everyone one day or another…

Text manipulation - Textopus http://textop.us/

webforms for just about every text transformation or conversion you might need - without having to write a script :D
“everything from sorting lines to advanced encryption and hashing”

online file conversion http://zamzar.com/ and http://www.pdfonline.com/convert-pdf/

When someone sends you a format you cant open… (in my case, something like microsoft publisher, or a vector file drawing at work)

what is its color http://whatsitscolor.com/

Get the main colors from an image - similar to what you can get on colorlovers.com

Visibility check  http://www.vischeck.com/vischeck/

Vischeck is a way of showing you what things look like to someone who is color blind. You can try Vischeck online- either run Vischeck on your own image files or run Vischeck on a web page. You can also download programs to let you run it on your own computer.

Timestamp converter http://www.4webhelp.net/us/timestamp.php

(geeky) when you’re not on unix and you need to check a date, perhaps from a logfile entry

Recipe measurement converter http://www.ez-calculators.com/measurement-conversion-calculator.htm

This site has many other calculators and no ads…

File extension search http://file-extension.net/seeker/

what’s that file for???

password generator http://www.pctools.com/guides/password/ and http://www.fourmilab.ch/onetime/otpjs.html

Very handy if you’re creating accounts for people

DNS dig http://www.analogx.com/contents/dnsdig.htm and subnet calculator http://www.analogx.com/contents/cidr.htm

(geeky) check domain name records and test DNS servers, and figure out whether /24 really does what you think it does…

connection tests http://www.measurementlab.net/measurement-lab-tools

what is your ISP doing to your pipes…