Every salesforce user will login in to salesforce through their account.At Salesforce, you will find free developer edition that allows you to develop application for force.com for free.
Create free Developer Account in Salesforce
1.Go to http://developer.salesforce.com
2. Now click Sign Up
3. Fill all details with valid Email Address.
4.An Email will b sent to your Email Address.
5. Now click the link provided in Email.
6. Set your password to your account.
7. Now you are able to login with salesforce developer account.
8. Go to https://login.salesforce.com.
9. Enter your Username and Password click on LogIn.
10.Now you are on Salesforce.com Home page.
That’s all for Create free Developer Account in Salesforce, still have any issue feel free to add a ticket and let us know your views to make the product better http://webkul.com/ticket/index.php