Certain business tools can save you time and effort and the best thing is that you do not have to pay even a peeny
Shoeboxed - document and business card capture
Zoho CRM - customer relationship management software
Wave Accounting Software - accounting software (cloud based)
Adding some useful tools for online business
Google Analytics - This robust reporting tool can tell you almost everything you need to know about the visitors to your website, the content they consume and the efficacy of your digital programs.
Dropbox - share all of your important stuff with others
LogMeIn.com - has the ability to quickly log in and use software on your desktop from anywhere, regardless of whether or not the device you are on has the same software.
Very useful suggestions so far, I would like to add a tools for selling products on-line: