To understand about your websites, you have to track, measure, compare your websites performance time to time. Also, you can make plan to find the errors by using tools and resolve those problems for better performance of your site. Find out, why your site taking more time to load, why speed up and down and get different types of hits and changes, connect between sever and your website and performance of javascript, css and so. Below, see the tools that might help you.

PAGE ANALYSIS:

1. SEOmoz Page Strength Tool – A useful tool that gives an overall look at the strength of a page.
2. Sitening’s SEO Analyzer – See if your pages are structured to achieve high search engine rankings.
3. Self SEO’s Page Speed Checker – Test the load time of your pages and your competitor’s pages.
4. GoogleRankings.com – Check the use of keywords and phrases on your site.
5. Popuri – See several items such as PageRank and inbound links all at once.
6. Keyword Density Analysis – See how frequently you are using certain words and phrases.
7. Meta Tag Analyzer – How are search engine spiders seeing your meta tags?
8. Code to Text Ratio – Check for code bloat.
9. Strongest Subpages Tool – Finds the 30 strongest subpages on your domain.
10. Similar Page Checker – Avoid duplicate content.
11. SEO Analysis Tool – Measures the ranking potential of a page.
12. WebSitePulse – A few different tools to test your sites performance.
13. Website Grader – Get a score for your site and even compare it to competitors if you want.
14. Watchfire WebXACT – Test for quality, accessibility, and privacy issues.
15. Monitis – website performance monitor
16. Mon.itor.us – free website performance and uptime monitoring
17. Semonics – web search position monitoring (in beta)
18. Mybuzzmonitor – buzz tracking widget for bloggers and website owners.

STATS:

1. Google Analytics – The leading free stats program.
2. AWStats
3. StatCounter
4. AddFreeStats
5. OneStat
6. Smart Tracking
7. Alexa – See where your site ranks.

BLOG STATS:

1. FeedBurner – Stats on your feed and your subscribers.
2. pMetrics – from Performancing.
3. pMetrics Plugin- Extending pMetrics.
4. IceRocket – Free stats program for blogs.
5. Technorati – See who’s linking to you.

STATS PLUS:

1. Crazy Egg – Provides visual data about your visitors.
2. Mint – An extensible, self-hosted web site analytics program.

WEBMASTER TOOLS:

1. Google Webmaster Tools – Lots of information that shows you how Google sees your site.
2. Web CEO – A collection of a number of useful tools. Free and paid editions.
3. Google Site Performance Checker - This features still under Google lab, when you verified your account and automatically google will show the graph of your websites performance and easily you can track how your site performance and read more in details.
4. Site-perf – Another site performance measurement tool, just like pingdom.com but much more realistic and the color indicator will give you idea of your sites performance and it’s so user friendly.
5. Websiteoptimization – You can analazie your website’s performance by using their service and get how much time taking to load your web pages, images and so on.

CHECK AND TRACK SEARCH ENGINE RANKINGS:

1. Sitening’s SERP Tracker – Test your page’s optimization.
2. Search Engine Rankings Checker – From Mike’s Marketing Tools.
3. Google Banned Checker – Has the largest search engine in the world banned your website? Find out here.
4. Number of Pages Indexed – How many pages do you have indexed by search engines?
5. Website SEO Checkup – Make sure you’re ready to get high search engine rankings.
6. GeoTargeting Detection Tool from SEOmoz – Determine how well your site is targeted to country specific search engines.

GOOGLE PAGERANK:

1. PageRank Prediction – You need a minimum of 100 backlinks.
2. Smart PageRank – Check your PR.

REPUTATION AND BUZZ MONITORING:

1. Google Alerts – Have preset alerts sent to you by email.
2. co.mments – Monitor comments on blogs.
3. Conversation Tracker from BlogPulse
4. Trend Search from BlogPulse
5. Keotag – See if blogs are using your company name in the tags of their blog posts.
6. BoardTracker – Watch for mentions of your company in forums.

LINKS:

1. Dead Links tool from W3C – Find broken links.
2. Link Popularity Checker – From Mike’s Marketing Tools.
3. Xenu’s Link Sleuth – Find broken links.
4. Backlinks and Anchor Text – See who’s linking to you and what anchor text they are using.
5. Reciprocal Links Checker – Do you have agreements with others for reciprocal links? Check them here.

SPIDER SIMULATOR:

1. Summit Media’s Spider Simulator
2. Spider View
3. Webconfs.com Spider Simulator

CSS ANALYSIS TOOLS:

1. Clean CSS – Formatting and Optimizing
2. CSS Tidy – Optimizer and parser.
3. CSS Redunancy Checker – Redundancy is easy to do with CSS. Fix it with this.
4. CSS Analyzer – A validator plus.

VALIDATORS:

1. HTML – Validator from W3C.
2. CSS – Validator from W3C.
3. RSS – Validator from W3C.

WEBSITE PERFORMANCE:

1. AlertSite Website Performance Monitor
2. KeyNote
3. WebWatch Bot
4. IPCheckPoint

GOOGLE ADSENSE:

1. Free Charts and Graphs
2. AdSense Notifier – Shows your AdSense stats in the status bar.

BROWSER COMPATIBILITY:

1. BrowserShots – See screen shots of your page in a number of different browsers.
2. Ready.mobi – Test your site for use with mobile browsers.

OTHER:

1. Geotargeting – find the location of your host’s servers
2. Find Your Site’s IP Address

Via 69 Tools to Monitor, Measure, and Track Your Website