Kideas is a great website if you are looking for ideas of for arts and craft projects. All the projects are simple and do not require complex material. In all, there are about 40 craft ideas. They all come with a pictures and a PDF giving all the material and instructions to do it. 
There are also many colouring pages. For kids who prefer to be artistic with food, there is a "creative food" section. Finally, the parenting tools will be helpful for parents with tips and ideas such as how to make your own baby sling, how to prepare a weekly chore chart, a diaper and feeding chart of a homework log sheet and some lunch box notes!
A Kid's Photos is a website that provides you pictures for you as a teacher or for your students. The photos are available in four main topics : animals, scenic, flowers and objects. They are not very high resolution, but for most student projects, they will be appropriate. The photos are taken by the two authors of the website and the terms of use state that you may use the photos in any of your projects under the provisions that you may not include the photos in another collection for distribution, you may not claim the photos as your own and you do not directly link to the photos. Even if the collection is not complete and will not answer all your needs for photos, it is a great resource and you may always opt for a membership at www.clipart.com if you need more.
"The Brain from Top to Bottom" is a great site provided by McGill University and it will cater to high school students as well as college or university students. In fact, when reading an article, you get to choose at what level you want to read: beginner, intermediate or advanced. You can also start to read it at the beginner level and if you understood most of it, you can re-read it at the intermediate or advanced level. 
The website is also divided by themes. Among the theme, you will find memory, pleasure and pain, emotions, evolution, movement, senses, mental disorders, development, language, sleep and dreams and consciousness. It is a gold mine of information in both French and English for high school teachers who refer to the brain in their classes.
WordChamp is a very incredible tool to let your students practice the vocabulary while learning a second language. In order to use this website, you will first need to register and create a class. Registering is totally free and I tried to find if they will charge you something at a later date, but I couldn’t find any mention of it. Wow! Registering is quick and easy. When creating a class, you need to indicate the main first language of the students and the language they want to learn. It is also possible to create more than one class with only one account if you teach students at different levels or if not all your classes are learning the same second language. 
This is a quick and easy one. It is a very simple calculator. Obviously, it is not scientific or graphic, but it does the job in elementary school when students forget their own calculator.
This animation of the heart is a great way to teach your students how the heart acts as a pump. The students can visually see the systole and the diastole and the contraction of the ventricle. A graph pressure vs. time shows the pressure in different part of the heart at different time. There is also a graph of an electrocardiogram and of the heart sounds. It is a great resource for biology teachers.
The Kids' Lab present reading workouts that are designed for parents and teachers to work with students who need some practice with their reading skills. 
They are designed to be done with an adult because the student can get confirmation when he or she is right and may be corrected when there is a misunderstanding. The reading workouts are available for these grade levels : kindergarten, first grade, second grade and third grade. The workouts put the emphasis on vocabulary development, phonics and phonemic awareness and reading comprehension. The workouts are not easy to find on the website at first. You need to use the "GO" menu in the top left corner of the screen.
Here is a great quiz to teach your students the difference between physical and chemical changes. The quiz contains 20 questions including examples such as breaking glass, a rusting bicycle, spoiling food, bleaching your hair and burning leaves. Very simple but efficient.
The University of Victoria in British Columbia presents 200 vocabulary exercises for students learning English as a second language. The exercise is very simple and looks like a resource already presented on this blog : illustrated vocabulary. An image is presented to the student and he or she must select that proper word. The vocabulary words are in the following categories : furniture, school, office, home appliances, kitchen utensils, clothes, animals, coins and food. An interesting fact, the coin category is adapted to the Canadian audience.
If you need a periodic table, well layed-out and all in colour for your student, the one published by the National Research Council is great. It is available on-line as a website with an hyperlink for each element that takes your to a description and as a PDF, ready to be printed on cardstock and laminated to be used a reference in your students' binders.
