People who use Thunderbird also use:
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WordPress
in 97 toolboxes
add to my toolboxFlexible open-source content management and blogging software with an active user and developer community and a wide variety of plug-ins or extensions available.
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Drupal
in 93 toolboxes
add to my toolboxVery extensible CMS platform based on PHP and used by many NGOs - "Community Plumbing"
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Firefox
in 221 toolboxes
add to my toolboxPopular open source web browser from Mozilla
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Skype
in 141 toolboxes
add to my toolboxFree/cheap Internet telephony and handy IM tool.
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del.icio.us
in 125 toolboxes
add to my toolboxWeb based social bookmarking lets you share online finds and discover new ones. Ground zero for tagging.
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OpenOffice
in 120 toolboxes
add to my toolboxFull-featured open source office productivity suite, featuring word processor, spreadsheet, presentation, drawing and database packages; free MS Office replacement.
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Ubuntu
in 86 toolboxes
add to my toolboxUser-friendly Linux distribution
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Pidgin
in 59 toolboxes
add to my toolboxA multi-protocol Instant Messaging (IM) client
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Flickr
in 109 toolboxes
add to my toolboxWeb based photo sharing service
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GIMP
in 58 toolboxes
add to my toolboxA freely distributed piece of software for such tasks as photo retouching, image composition and image authoring.
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Wikipedia
in 76 toolboxes
add to my toolboxWikipedia is a global and multilingual Web-based cooperative free-content encyclopedia.
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Social Source Commons
in 77 toolboxes
add to my toolboxThe Social Source Commons is a “knowledge commons” that provides users with: a directory of software applications; links to relevant documentation, localization tools, services, user reviews; and a place to request tools/features.