Sure, you can try to create a flow chart with a word processing program such as MS Word, but you’re going to get angry. Your boxes will be different sizes, and your arrows won’t line up. It’ll take you too long, and screw up your diet when you visit the vending machine for a chocolate bar to get through the project.
Gliffy lets you create professional flowcharts, floor plans, technical drawings and other graphic necessities.
The basic subscription is free and works for most casual users if you can deal with the logo. The premium version starts at $5 per user per month.