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Calkoo

Calkoo provides free online calculators for almost any purpose! Calkoo is perfect for anyone who needs to do a few quick calculations.
Numerous calculator applications are available here that let users make various calculations a lot easier than they normally are. A simple bond yield calculator or a fuel cost calculator application can save you the valuable time you would otherwise spend on lengthy manual calculations.

Ptable

Ptable is an interactive Web 2.0 periodic table. It provides dynamic layouts, property trend visualization, orbitals, thousands of isotopes, and 5 writeup sources. The application uses no Flash or images, giving all the scalability and accessibility of a normal web page (it can be viewed on any kind of computer and device).
The layout, unless differently specified by the user, automatically switch to fit the width of the screen. Using the check boxes at the top of the page allows to dynamically switch between various configurations (simple, with names, with electron configuration, and inline inner transition metals).
In addition to Wikipedia descriptions in all languages, write-ups, photos, videos, and even podcasts are offered in the first tab's dropdown. Write-up windows can even be torn off or docked to the edges to allow simultaneous use of the table while reading.
Data is acquired from primary sources and curated libraries. Layout and presentation were reviewed by the world's foremost periodic table academic, Eric Scerri. Translations and non-English element names, however, should be considered no more reliable than Wikipedia.
Search (into the box at the top right) can be performed by name, symbol, or atomic number. Advanced searches work, for example, on the atomic weight, number of orbitals, etc.
Most browsers, tablets, and phones can store the site and its data for use offline. Firefox prompts you with a notification bar at the top while Chrome and Safari directly save it.
Full descriptions in 40 languages from Wikipedia.

Tux Paint

Tux Paint is a free drawing program for children (3 to 12) that combines an easy-to-use interface, fun sound effects, and an encouraging cartoon mascot who guides children as they use the program. It is used in schools around the world as a computer literacy drawing activity.
The program runs on multiple platforms. It’s simple interface presents a number of useful drawing tools and at the same time relieve the user of the need to think about the technical details.
Sound and visual helps are available: fun sound effects are played when tools are selected and used and a cartoon mascot appears at the bottom to give tips, hints and information.
Parts of Tux Paint have currently been translated into almost 100 languages.
Stamps, starters and brushes are stored using popular open formats (PNG, SVG, Ogg Vorbis, etc.) allowing parents and teachers to create their own content for use at home or in the classroom - even using completely free tools.
The 'Tux Paint Config.' program allows parents, teachers, and school technicians to alter Tux Paint's behaviour using a simple, easy-to-use graphical interface.

System requirements: 
Operating System Requirement Windows: Windows 95, Windows 98, Windows Me, Windows NT 4, Windows 2000, Windows XP, Windows Vista, Windows 7 Mac OS X: Requires Mac OS X, version 10.3.9 or later Linux: (No special OS requirements) Disk Space Requirement Note: Disk space requirements are for the base installation. Obviously, as you create and save images using Tux Paint, more disk space will be used. Tux Paint Windows: Approx. 16MB Mac OS X: Approx. 16MB Linux: Approx. 16MB Tux Paint Stamps (Full installation) Windows: Add Approx. 70MB Mac OS X: Add Approx. 70MB Linux: Add Approx. 70MB Minimum Recommended CPU Windows: 200MHz Pentium Mac OS X: 233MHz G3 Linux: 200MHz Pentium, 233MHz G3, etc. Peripheral Requirements Monitor: 640x480 or higher; 800x600 recommended Video Card: Capable of 640x480, 16bpp (thousands of colors) or better; 1024x768 or better, 24bpp recommended Mouse: One button mouse or better; scrollwheel supported, but not required; (any device that acts as a mouse is supported, e.g.: touchscreen, drawing tablet, tablet PC, trackball, lightpen, etc.) Memory (RAM) Requirements At default resolution (800x600) Windows: Approx. 40MB free Mac OS X: Approx. 16MB free Linux: Approx. 33MB free At smallest resolution (640x480) Windows: Approx. 28MB free Mac OS X: Approx. 32MB free Linux: Approx. 24MB free At very-large resolution (1600x1200) Windows: Approx. 150MB free Mac OS X: Approx. 55MB free Linux: Approx. 140MB free

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Scratch

Scratch is a programming language that makes it easy to create animations, interactive stories, animations, games, music, and art. The outcomes can be stored and shared on the web within the Scratch system.
It is not only an ideal tool for the creation of simple and attractive interactive and/or animated learning objects, but it also serves as a learning instrument for young people. By using Scratch learners learn not only to create and share Scratch outcomes but more importantly they learn mathematical, logical and computational ideas, while also learning to think creatively, reason systematically, and work collaboratively.
Scratch is at first sight a bit difficult to learn, but there is a (short and simple) manual that helps everyone getting started within minutes. It is not a full blown animation tool but it is a lot of fun and very rewarding to work with.
Scratch is developed by the Lifelong Kindergarten Group at the MIT Media Lab, with financial support from the National Science Foundation, Microsoft, Intel Foundation, MacArthur Foundation, Google, Iomega and MIT Media Lab research consortia.

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System requirements: 
Browser Installer available for Mac OSX 10.4 or later, Windows 2000, XP, Vista, and 7 and with Ubuntu version 9.04 and later

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