Free but limited commercial real estate software is available from Aptotude, Dotloop, Costar, Catylist, ARGUS Software, REI Wise, RealHound, REA, and Investit Pro.
The main difference between freeware software and commercial software is that one is free to use by anyone. The other, the commercial software, requires a license and usually costs money to use.
Audacity is free. It works with windows, mac, GNN/Linux and other systems. Although the system is free they would accept donations. You can find Audacity at audacity.sourceforge.net. You also can get wavepad audio editing software at www.nch.com.au. This is also free as long as it isn't for commercial use.
Commercial software offers registration codes when you buy the program.
Yes, you can use Linux software commercially, depending on the licence issued by the software developer. A lot is free entirely, some are free for home (non-commercial) use only, whilst some come with a commercial licence fee to pay.
One can find free 3D animation software at the 'Blender' website. The software can be downloaded and used for free. One can find similar software from 'Anim8or'.
You can find free CAD software to download. You can find this software from CNET. CNET offers many free programs for people to download. It is highly recommended.
Google,yahoo lost of search engine you can find QA Software for free.
There are many places to find free software to build a website. A good place is the website "allaboutyourwebsite" to find free software to build a website.
You can find free CAD software online at: www.freecad.com/, download.cnet.com/mac/cad-software/, and also online at www.cadazz.com/free-cad-software.htm.
Enter "free software" in Google or go to download.com and search for free software.
The LabVIEW and LabVIEW NXG Community edition is free for non-commercial use.
You can find some free federal tax software at www.taxact.com. On this site you can download the free Tax ACT software that will allow you to file your taxes for free.