VSO Inspector - VSO-Inspector is a free add-on to report various information about your hardware configuration.
Polls for WhatsApp - Create & share quick polls in your WhatsApp groups
CDCheck - CDCheck can check each of your CDs and DVDs and indicate which files are corrupted.
Curious Polls - Answer a question once a day for the chance to win £100/$100
DVD Identifier - DVD Identifier offers a reliable method of accurately identifying a disc's real manufacturer.
Twitter Polls - Polls embedded in tweets