what is software marketing?

Answer 1

Seeing how this falls under SEO, I would presume you are referring to advertising a Web site via the use of a program that automates certain tasks vs. doing it yourself manually.
For example, some software might create META tags for a Web site by scanning the page for keywords and inserting what it finds into the code, possibly saving you some time (or not).
Obviously, software is not perfect and as a rule has to be monitored constantly, as in the above example the software may inadvertently extract keywords that have nothing to do with your site by themselves, which may highlight some issues for you to correct or it may just be a stupid program error.
Thus software needs to be monitored, which is to say humans still do it best.

Answer 2

There are quite a lot of solutions that works. Let me underline some of them:

Article Submitter
http://www.submitsuite.com/products/article-submitter.htm

Website Submitte
http://www.submitsuite.com/products/website-submitter.htm

SeoElite
http://www.seoelite.com/index2.htm

These 3 softwares for example combine article submission, website submission to directories with seoelite features for checking concurent webiste links and advertising tactics.