We chose Indeed because it has a large recruiting pool. We have also used a startup called Planted that takes recent college grads and puts them into entry-level jobs at different startups. It didn't work for us because we're in Greenwich, CT, but it's a good service. They found us great people, but no one accepted the job because no one wanted the commute. It would probably work well if you were in New York City or Los Angeles.
We use BugHerd with third-party developers. It’s a bug-tracking tool that's very effective for web development. It's a plugin and allows you to take screenshots so it's very clear to the developer what your trail was when you encountered a bug. It's great on a desktop, but not very good on mobile.
We give independent contractors the option of having their earnings transferred into a GiveBack.org account, and they can distribute the funds from there. GiveBack.org is a great service that I recommend for a lot of big employers.
Independent contractors can choose to be paid through Money Network, a prepaid card option.
We offer our independent contractors direct deposit through Bank of America.
We use TriNet for our employee payroll, but we have hundreds of independent contractor salespeople, since we're a direct selling company, and we offer them four different ways of getting paid, so we have several different vendors. We'll also contribute to their college savings, but that's all done manually.