Use Forum posting, bookmarking, article submission, blog commenting, press release etc to increase backlinks Is these tools really helpful.

follow the Off page activity
Forum submission
Blog submission
Bookmarking submission
Search engine submission
Web 2.0 submission
Classified submission
Blog commenting

There are best way to increase backlinks:
1.Forum posting
2.Blog post
3.Social Bookmarking
4.Ad posting

The 10 topic following increase back links are:
Write Useful, Interesting, and Fresh Content
Create Highly Shareable Content
Avoid Tricks and Designs that Damage User Experience
Create Resource and FAQ Pages
Create Round-up Posts
Create Templates, Worksheets or Useful Documents
Write and Publish Quality Guest Posts
Write for Other Blogs and Websites
Make Sure Your Blog is Search-Friendly but Not Over-Optimized
Repurpose Your Content

You can do Off-page SEO techniques such as business listing submission, blog posting, blog commenting and social bookmarking for increasing your website backlinks.

Unnatural links are naturally going to decay over the course of time, so put your white hat on and find some sites that are relevant to your business, then offer guest postings.