Why should you pay for a chart program if you can geti it for free?
Autodesk published an impressive web application completely free to let you draw you own charts online.  Project Draw allows you to do everthing you need:

http://draw.labs.autodesk.com/ADDraw/draw.html

You don't need to have a product serial number to use all the features: just create an account and skip the last step where you are asked to provide the key:

 https://registeronce.autodesk.com/eidm/selfcare/beginSelfRegistration!input.action

Don't forget to register and press ctrl + d once you have visited the link