Once upon I was a somewhat traditional Spanish teacher and thought it would be useful for my students to practice grammar with simple online quizzes. I created a website to handle Spanish quizzes. It does a bunch of the quiz generating automatically and knows a fair amount about Spanish and English grammar. It also supported uploading quizzes and OpenID log-in for students. I imagine it wouldn't work out of the box now (it's been years), but my Spanish verb conjugating library might be of use, and it probably wouldn't take too much work to get it working again if someone wants it. I believe the server I used to host it on has been long forgotten about (I became a more immersion-based teacher in the time since this was released, so I stopped giving students these kind of rote memory tasks anyway, though I'm sure for a certain subset of learners this kind of practice is still useful).