Where can I promote and market my business free of cost?

[Survivor]

My target group is SEO companies and I am into web-content development.

[Star]

OLX , QUIKR , ALL online Free ads website

[Richard]

Here are places where you can get online presence:
Social media: Facebook, Twitter and especially Linkedin
Youtube - create a video and promote it here
Bussiness directories
Web 2.0 sites
Community forums
Content sharing sites
Blogs and blog networks through commenting and guest posting
Press release sites

Choose only relevant sites. Analyze competitors and see how they do it. Hope this helps

[Venu]

Content is king of SEO. choose Content marketing submit content in Articles, guest posting, press release and blog submission. Recent panda penguin also recommended it. The content must be unique and follow all seo rules, surely you can attracts a lot of seo projects.