Google Apps has a nice little API that was developed for interfacing with it programatically. Well, a number of other vendors have been building around it for a little while and there’s starting to be a nice little suite. Here are some to look at: Manymoon: Allows more granular document sharing, mail management and security with your documents, tasks and projects Socialwok: Allows you to build a social network on top of Google Apps Smartsheet: Project, sales pipeline and resource tracking. Allows for collaboration with external users as well. Tripit: allows you to see your travel plans and collaborate with others on their travel plans (wish American Express Travel had…