ReVou Micro Blogging is a revolutionary PHP software that allows you to start your Twitter clone site. ReVou offers you the next generation social networking and mobile blogging solution for your users bringing more viral growth for your site. Revou...

Laconica is a open source twitter clone. It's not full published yet but it will work like twitter and you're able to run it on your own site. There's already a version running: http://identi.ca/

One of the most popular trends on the web today is something called "Micro-Blogging". Made famous by Twitter.com, Micro-blogging is the best and most simple solution to answering the everyday question, "What are you doing?". To most, it is used...

Yonkly is an open source twitter clone, micro-blogging platform that lets you create text & picture messages with threaded conversations and groups.

A Twitter clone script