Depends on what type of editing software but one common need is free photo editing software. Then you can download Gimp that is a free editor and can be found at a website with the same name.
You can download the free photo editing software GIMP online at the official GIMP website. You can also download Google's software for photo editing called Picasa available on the Google website.
Free online Photo Editing software is readily available through major editing outlets. Some companies offer in web browser editing while other companies require that you download their software and you can use the software offline.
The Microsoft Movie Maker software can be downloaded from the Official Microsoft Download Centre online. System requirements include having a version of Microsoft Vista installed.
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Free photo editing software can be picked up on the internet as well as from someone you know. Normally you want to search for "Open Source" or "free public" or just "Free" photo editing software and more than likely there will be dozens of software to find and download that will work for you.
Companies that offer a free video editor for download include camtasia, avc, real, video pad and vlc. You will be able to find such editing software online.
There are several places online where you can download free tax software. One of the most popular is from TurboTax.com.
There are many online shops that sell audio editing software. Amazon.com is one of online shop that sells audio editing software with any kind of reviews and you get a free guide. You can visit www.amazon.com
You can download CAD software online through Microsoft's website. They have a download section on their homepage. Just check out this section and it will lead you to the software.
One can download free anti spam software online at various websites. One can download free anti virus software at websites such as Avast, McAfee, and SPAMfighter.
Picnik or lunapic are great free web based (nothing to download) editing tools. If you need/want more features downloading GIMP is a great options. There are also free tools to add text blurbs, to make collages, to put your photo into other images. There are a number of tools that allow you to put the image of a face into other photos for some fun creations.
Picasa is a software designed by Google for the purpose of image editing etc. Usually the older versions of Picasa are free to download, like Picasa 3.