Horde - Horde Groupware is a free, enterprise ready, browser based collaboration suite.
Skuuudle - Discover, match and monitor your eCommerce competitors.
Roundcube - Web-based IMAP email client
Price2Spy - Price2Spy is a price monitoring, pricing analytics, and repricing tool, meant to help eCommerce professionals keep an eye on their competitors or retailers.
Mailo - Mailo is an email client where you can send and receive emails to and from anyone with an email address.
BuiltWith - Find out the technology behind websites