Big thanks to Rolf who sent me the link to this website. I'm a big fan of tools that don't require registration and are free and easy to use. Textivate ticks all the boxes. It allows you to automatically generate a range of interactive browser-based activities based on any text of up to 500 words. Simply type or paste a text into the box and click 'textivate now' button to see the available exercises (gapfills / sentence arrange / paragraph arrange / punctuation / splitting words). Great for exam classes or any other reading-based lessons.
szoter is easy to use, free, online image annotation tool. It makes expressing Your ideas and thoughts easy. It can be used to share Your ideas with friends, highlight important parts of images or even to create readable bug reports