So much from so little. That should be the tagline for Twitter, the microblogging site that limits each post to 140 characters. As I wrote in this column in December, Twitter’s simplicity belies its reach. That column listed my “Tweet 16” ways lawyers could use Twitter. Since then, I’ve discovered even others.

But while Twitter’s simplicity is elegant, it is also limiting. As a result, a cottage industry is emerging of hundreds of third-party tools to enhance Twitter. Here are 20 that stand out, in alphabetical order.