A nice and handy Calculator made by me using Visual Basic.
The user friendly captcha is stampcha
STAMPCHA is an alternative solution to user unfriendly CAPTCHA. STAMPCHA is a very user friendly and easy to install software for web sites. STAMPCHA is designed to show a series of images to user and ask a question based on that. only one image is the correct answer.Unlike other CAPTCH software its very easy for the users to respond.Users only need to type the relevant image number in the text box. Since the order of the images and the questions are generated randomly each time user visit the page Its practically impossible for robots to break. You can add your own questions and images which makes it even harder for the robot to break.