Joshua Thijssen has shared his toolbox for less than $100/month that includes a complete set of development and project tools "on the cheap" but still good.
There are a lot of tools out there which can help you as a developer / self-employed contractor. And even though most of these tools are free (as in beer), I don't mind spending a certain amount of money on tools that help me do my business. So with all the tools out there, all the paid plans, the freemiums and the trial periods, what can a crispy 100 dollar bill every month buy?
His list includes hosting (ServerGrove), issue tracking (Jira), team communication (HipChat) and online storage (Dropbox). His list is made up of eight services with almost all of them having a small cost. The online collaboration (Basecamp) and hosting (from ServerGrove) are the highest costs at $20USD/month.