Invoice SA - Send invoices faster. Get paid faster.
Jira - The #1 software development tool used by agile teams. Jira Software is built for every member of your software team to plan, track, and release great software.
Zoho Invoice - 100% free online invoicing software for small businesses.
Basecamp - A simple and elegant project management system.
Inveezy.com - Inveezy is a free invoicing website with no login.
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.