Original sentence: Although there is a lack of a Linux ports for some Mac OS X and Microsoft Windows programs in domains such as desktop publishing and professional audio, applications equivalent to those available for Mac and Windows are available for Linux.These free programs can be downloaded and installed with one mouse click and a digital signature guarantees that no one has added a virus or a spyware to these programs
Edited sentence: Although there is a lack of a Linux counterparts for some Mac OS X and Microsoft Windows programs in domains such as desktop publishing and professional audio, applications in many areas equivalent to those available for Mac and Windows are available for Linux.These programs are digitally signed to verify that they are malware-free, and can be downloaded and installed