lwty.org is described as 'Worksheets or practice exercises, calculators & answer sheets to engage the grade school students to learn, practice, test & verify the answers themselves to measure the progress of their own' and is a Calculator in the education & reference category. There are more than 50 alternatives to lwty.org, not only websites but also apps for a variety of platforms, including Android, Windows, Mac, iPhone and iPad apps. The best lwty.org alternative is SpeedCrunch, which is both free and Open Source. Other great sites and apps similar to lwty.org are Qalculate!, Numi, Soulver and Google Calculator.