Twuffer – A Twitter buffer that allows you to compose tweets in advance and then schedule their release.

appTracks: Web
appTags: compose future tweets, schedule tweets, tweets, updates

Twittercal – Connects your Twitter account with your Google Calendar and lets you make updates via tweets.

appTracks: Web
appTags: google Calendar, updates

Twitbin – A Firefox extension that allows you to keep up with all of your Twitter conversations right from your browser sidebar.

appTracks: Web
appTags: clean design, f, firefox extension, updates

Tweetscan – Sends you email updates when your keywords are mentioned on Twitter, identi.ca, and other Laconica-based sites.

appTracks: Web
appTags: identi.ca, keywords, laconica, updates

HelloTXT – Manage your content and updates to multiple social networks from mobile, web, sms, facebook, twitter, myspace, and much more. Manage, aggregate, and organize feeds.

appTracks: Mobile, Web
appTags: aggregate, facebook, feeds, myspace, organize, sms, text, tweets, updates

Digsby – Stay up to date with everything happening on your Facebook, Twitter, MySpace, and LinkedIn accounts.

appTracks: Desktop, Web
appTags: facebook, linkedin, myspace, updates