Online Tools | Dev buddies

Some of the very useful day to day online tools that can help a jdeveloper a lot
RegEx matcher
http://www.gskinner.com/RegExr/

JSON formatter
http://jsonlint.com/

XML tools
XML formatter
http://www.xmltoolbox.com/
XML to XSD converter
http://www.freeformatter.com/xsd-generator.html#ad-output
Use 'xjc' tool to convert the XSD to Java pojo classes which can be used to marshall and unmarshall using JAXB

Unicode tools
http://www.online-toolz.com/tools/text-unicode-entities-convertor.php

Diff tool
http://text-compare.com/