“Platform”, “API“, “App Store“, amazing the hot trends that appeared in the last years, pushed by companies like Facebook (and its F8 platform), Twitter (with their open API) and Apple (with THE App Store that everyone is talking about).

Here comes OneForty (for 140 charachters if you’re wondering why). It now seems normal to now have an app store for Twitter apps. Oneforty launched end of September, edited by Twitter for Dummies author Laura Fitton. Not really a store, as everything is free, but a good directory of the existing apps.

Twitter already has its own directory, but done on an editorial basis, and not refreshed in real-time, so OneForty should prove more useful.

Oneforty list all apps per category, developers can claim their apps, users can comment, rate and share the apps that they’re using (by signing in with your Twitter credentials)

Categories include:

• Desktop: Tweetdeck leading, followed by Tweetie for Mac (which tells that Twitterers are geeky and Mac users)
• Mobile: Tweetie (iPhone), Twidroid (Android), Echofon (iPhone)
• Business: HootSuite, CoTweet
• Monitoring/Search
• Networking
• Analytics
• Media sharing: Twitpic
• Link tools: Bit.ly, TweetMeme, Twitterfeed

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