Following are the best list of tools for On-Page Optimization
1) Google Keyword Planner
link: https://adwords.google.com/KeywordPlanner
2) Google Snippet Preview
link: http://www.snippetoptimizer.net/
3) Convert Word Documents to Clean HTML
link: http://word2cleanhtml.com/
4) Wordstream
link: http://www.wordstream.com/free-keyword-tools
5) Keyword Eye Basic
link: http://www.keywordeye.com/
6) Ubersuggest
link: http://ubersuggest.org/
7) Anchor Text Over Optimization Tool
link: http://www.removeem.com/ratios.php
8) Copyscape
link: http://www.copyscape.com/
9) Robots.txt Generator
link: http://www.yellowpipe.com/yis/tools/robots.txt/
10) Image SEO Tool
link: http://www.feedthebot.com/tools/alt/