Online Tools for Development

WSDL

Online WSDL Viewer and Validator

JSON

JSON Diff
JSON Editor Online - view, edit and format JSON online

JSONLint - The JSON Validator
On-line JSON Generator

Regular Expressions

RegExr

Highlighters

Online syntax highlighter like TextMate
Syntax Highlighter

String

Convert A String To Upper / Lower Case Online
Sort Text Lines (Sort a List)

WHOIS 

Whois Service
Whois сервис - Россия | Проверка домена и поиск имени сайта - Домены ищут у нас
1stat.ru
WhoisHistory. История WHOIS по домену

CSS

CSS Sprite Generator online by SimpReal

Generators

Generate a Random Name - Fake Name Generator

North American Address Generator
Computer Name Generator
Company Name Generator - Need a name for your company ? Generate it !
Random Date and Time Value Generator - Test Data Generation
RANDOM.ORG - Integer Generator
Project Name Generator

URL

URL Decoder/Encoder

Images

Postimage.org - free image hosting / image upload
Ajaxload - Ajax loading gif generator

Passwords

ПарольКарта

Time

Date Duration Calculator: Days between two dates

Elapsed Time Calculator at Math Cats
Age calculator at Math Cats