Twitxr: u can share pictures from ur mobile phone, automatically publish them on social networks & photosharing sites.http://www.twitxr.com/

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twit+ is a new service that works on top of twitter that lets u twitter with pictures or video and also send files. http://twitplus.com/

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TwitPic lets you share photos on Twitter. Can u see me? http://twitpic.com/

twitsay enabless you to leave a voice message on your Twitter profile for all your followers to hear. can u hear me? http://twitsay.com/

Twibler allows you to post your eBay listings to Twitter. http://twibler.com/

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Gwibber is an open source microblogging for GNOME developed with Python & GTK.Supports Twitter, Facebook & RSS.http://ping.fm/SAdCY

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Twittercal connects your Twitter account with Google Calendar. http://twittercal.com/