One of the actions people in the Mayor’s Action Challenge need to complete as part of demonstrating financial fitness is to create a valid will. http://www.doyourownwill.com/ has a simple will that is fairly easily without requiring a login etc. Recognize that it may not adequately address complex situations, for those you should see a lawyer.
Remember, have your will notarized and signed in front of two witnesses. Your bank often can provide that service.