Knozen is developing a personality API for the internet that aims to discover, and display the world’s personalities.
SendGrid is more of an “enabler”, as opposed to an email service.
MailChimp gets a 5 out of 5.
Upwork is great for hiring freelancers to help out with small projects for which you don’t need full-time staff.
The payroll tools I've used in the past were all infuriating. ZenPayroll is terrific--low-maintenance, and easy to use.
Trello is stupendous--we love it! All of our teams use it--for everything from product to recruiting and marketing projects. It's a much better way for helping us do things, rather than email or spreadsheets.