WaveShop - Open source audio editor
WhatFont - The easiest way to identify fonts on web pages
TwistedWave - TwistedWave is one of the unique audio editors that allow you to edit your music file online without any installation.
Fount - Identify web fonts on any site
Audacity - Audacity is a free and open-source audio production software suite that includes a surprising array of editing tools and recording systems.
Gradient CSS - Create CSS Gradients with Ease