
Moodle

Moodle is a course management system (CMS) - a free, Open Source software package designed using sound pedagogical principles, to help educators create effective online learning communities. You can download and use it on any computer you have handy (including webhosts), yet it can scale from a single-teacher site to a 50,000-student University.
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Download:here
Yacas
Yacas (Yet Another Computer Algebra System) is an open source general purpose computer algebra system. Its strength is in the language in which you can easily write your own symbolic manipulation algorithms.
This site is for a Macintosh OS X version. It uses gnuplot for generating 2D and 3D plots.
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Download:here
FreeMat

FreeMat is a free environment for rapid engineering and scientific prototyping and data processing. It is similar to commercial systems such as MATLAB from Mathworks, and IDL from Research Systems, but is Open Source. FreeMat includes several novel features such as a codeless interface to external C/C++/FORTRAN code, parallel/distributed algorithm development (via MPI), and plotting and visualization capabilities. FreeMat is available under the GPL license. Supported platforms include Linux, Windows and Mac OS X.
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Download:here
Google Earth
The idea is simple. It's a globe that sits inside your PC. You point and zoom to anyplace on the planet that you want to explore. Satellite images and local facts zoom into view. Tap into Google search to show local points of interest and facts. Zoom to a specific address to check out an apartment or hotel. View driving directions and even fly along your route. We invite you to try it now. Google Earth is free for personal use. No registration is required
Features:
- Free for personal use.
- Sophisticated streaming technology delivers the data to you as you need it.
- Imagery and 3D data depict the entire earth - Terabytes of aerial and satellite imagery depict cities around the world in high-resolution detail.
- Local search lets you search for restaurants, hotels, and even driving directions. Results show in your 3D earth view. Easy to layer multiple searches, save results to folders, and share with others.
- Layers show parks, schools, hospitals, airports, shopping, and more.
- KML – data exchange format lets you share useful annotations and view thousands of data points created by Google Earth users.
Use it for:
- Planning a trip
- Getting driving directions
- Finding a house or apartment
- Finding a local business
- Exploring the world
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Download:here
OmniDictionary

OmniDictionary is a Mac OS X client for network dictionary servers. It's pretty straightforward - type a word into the entry field, hit return, and the definition is displayed. If the dictionary server supports multiple dictionaries, you can select your desired dictionary from the dictionary popup to limit queries to that specific dictionary, or you can query all the dictionaries.
Since OmniDictionary is simply a client for dictionary servers on the web, you have to be connected to the Internet (or have access to a local dictionary server) in order to be able to perform lookups.
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Download:here
IceClean
There are a lot of tools out there to keep your mac running smooth and effective, IceClean is a good option. Download the app and take it for a spin. There are a lot of different tasks you can do. (Another similar option (and my favorite) is MainMenu. I love that it sits up in my menu bar ready to answer to my commands.
Download:here
Integrity

If you are going to take the time to run a site you’ll want to be sure it all gets kept up nicely. You’ve got to watch out for broken links and moved pages. Integrity will help you out. Feed it your home page address (url) and Integrity will follow all of your internal links to find your pages, checking the server response code for all internal and external links found.
So take some time and check out your site. Just be ready in case you have some site-maintenance work ahead of you.
Ebbinghaus

Ebbinghaus is a well done application that helps you learn things. Once you input a list, the application will quiz you with the questions and answers.
Like freeware apps Genius and ProVoc, Ebbinghaus will teach you with repetition. But Ebbinghaus has a great color coding feature that will keep track of your progress. You also have the ability to input photos. This would be great for memorizing things like country flags. When you install the app there is an example list to see if you can name some past Apple products.
And once you have your lists in you can share them with others or export them to your iPod. Nice.
Download:here
Smell-O-Mints

Smell-O-Mints is a pretty little periodic table of the elements, and is a simple but well-organized app. A pulldown menu lets you easily view the table according to state, radioactivity, metal vs. nonmetal nature, etc. There is also a search feature to find elements and a link to Wikipedia to learn more about them. Click on any element to view more information, including weight, radioactive properties, and atomic number. Science is fun.
Download:here
Tadalist

For a long time I wanted to have a way to keep to-do lists for myself. I took a look at all the online options and all the applications available for download. I just had a hard time finding one that I liked. This changed when I found the Ta-da List Widget. And ironically, it is a mix of online and local.
Tadalist.com is a free service from the good folks at 37Signals. When I first checked out the service, I thought it was nice but kind of a pain to have to do all dealings thru the browser. When I found the widget I was sold.
First you’ll have to make a free account withTadalist.com. Once you sign in online once, you may never need to visit the site afain. Ta-da lists widget makes it really easy to create new lists and add to-do’s for that list. For instance, I have “Do For Work”, “Do For Sites”, “Do For Church”, and “Random To-do’s” as my four lists. You can have as many as you’d like.
To enter in a new to-do for any list, it’s as easy as typing it in and hitting return. Clicking on the header image will open up your account online. I especially like that you can choose whether to sync the lists everytime that you activate dashboard. If you only use one computer, you don’t need to do this. But, if you have multiple computers like I do, you can sync with the site each time and the lists will stay up to date on all of the computers.
Big thanks to the developer for this. I don’t run a lot of widgets (1,2,3,4), but this one makes the cut. I liked it so much that I donated for his efforts. Honestly, between this widget and my new email reminder system, I’ve been much more productive lately.
Download:here
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