Maciej Szwarc, an ESL teacher from Warsaw, Poland, and his programmer friend Tadek have built an online tool called Lesson Ninja.

It helps language teachers create their own customized gap-fill and matching exercises in a quick way. On top of that it enables them to share a link with their students for an interactive online exercise or assign it as homework.

Their main motivation was to save time on class prep without compromising the quality of their classes. They’ve been creating personalized materials for their students for many years now. That’s why they’ve designed this tool.

Have a look at their website for more info on pricing, FAQs and a tutorial. Feel free to contact them if you have any questions.

Martin Sketchley has also interviewed Maciej. You can watch the interview here.