Enter the lengths of two sides of a triangle and the measures of the angle those two angles form, and this will give you a sketch and the opportunity to show the missing measures.
It was designed with the goal of giving students/teachers and inexhaustible supply of practice. Students can create and solve their own problems, and be able to check their results. The twofold gain is allowing students to discover when they have errors all by themselves, and saving the teacher from the role of answer-checker.
File available at http://tube.geogebra.org/m/1517789