1. Anchor Text Over Optimization Tool
Link Research, Technical SEO
Worried about Google's Penguin algorithm hitting you for over-optimized anchor text? Simply type in your URL for a full report of which links might raise flags.
2. Bing Webmaster Tools
Tools Suite, Diagnostic
Similar in function to Google Webmaster Tools, Bing offers a suite of interesting research tools and resources for webmasters.
3. Bitly
Social, Analytics
Most people use Bitly for URL shortening, but the real power of this platform comes from its analytics.
4. Boomerang
Email, Productivity
Boomerang lets you follow up on emails, even when you forget. Great for link building or any time you send a lot of emails.
5. Buffer
Social
Optimize your online social media sharing. Buffer allows you to share with your audience at the optimal times for greater visibility.
6. BuiltWith
Competitive Intelligence
Use BuiltWith to discover what technology nearly any website was, well, built with. Great for competitive intelligence as well.
7. Buzzstream Tools Suite
Link Building, Tools Suite, Email
Most people know Buzzstream as an outreach platform, but they also offer a number of free link-building tools. This company gets it.
8. Caption Tube
Video
Free and easy resource used to create captions for YouTube. Helps with usability and offers viewers a readable transcript.
9. CircleCount
Social, Analytics
Google+ analytics ramped up. Free resource to track your followers and analyze your shares. See how many followers you've gained over time.
10. Content Strategy Generator Tool
Content
This tool from SEOgadget helps you plan your content strategy intelligently, using keyword research and estimating your audience size.
11. Convert Word Documents to Clean HTML
Content, Productivity
Despite the rise of Google Docs, Word still dominates much of the world. Copying and pasting has always been a hurdle, but this tool makes it easy.
12. Copyscape
Content
Copyscape serves both as a plagiarism checker and a duplicate-content checker. Great to use if your content has been distributed across the web.
13. Domain Hunter Plus
Link Building
This magic extension for Chrome not only helps you find important broken links, but also tells you if the links point to an available domain.
14. Easel.ly
Infographics
Free tools for creating and sharing inforgraphics. The templates allow anyone to create a professional-looking graphic.
15. Email Format
Email, Productivity
Email Format helps you find the proper structure for thousands of companies and organizations across the web.
16. FindPeopleonPlus
Social
The ultimate Google+ directory that's great for research, outreach, and link building. Sort by keywords, profession, country, and more.
17. Frobee Robots.txt Checker
Robots.txt, Technical SEO
Many robots.txt files contain hidden errors not easily visible to humans. Run your file through this tool and you never know what you'll discover.
18. GetListed
Local, Moz
This awesome local SEO tool scores your local SEO visibility and gives you actionable next steps to raise your score.
19. Google Keyword Planner
Keyword Research
The tool to replace Google's popular keyword tool has been derided by some, but still offers data not available anywhere else.
20. Google Analytics
Analytics
The most popular of all the analytics tools available, Google Analytics continually innovates and sets the standard.
21. Google Analytics API
API, Analytics
The Google Analytics API is great for building custom reports and tools, and also for pulling data straight into Excel or Google Docs.
22. Google Map Maker
Local
Among other things, Google Map Maker allows you to contribute to public map information, which may be shared and incorporated into Google Maps.
23. Google PageSpeed Insights
Speed
Tools, data, and insights to improve your page speed. Page speed is correlated with better rankings and user engagement, so this matters.
24. Google Public Data
Content
Drawing on vast public databases, Google public data offers a great starting point for content research, infographics, and more.
25. Google SERP Snippet Optimization Tool
Technical SEO, CRO
That SEO Mofo! Use this tool to see how your snippet may appear in Google's search results. Add structured data, review stars, and more.
26. Google Structured Data Testing Tool
Structured Data, Technical SEO
If you use Schema.org microformats or any other type of structured data, this tool will verify your markup.
27. Google Trends
Keyword Research
See what's trending in Google search results and view keyword search popularity over time. A must for trends.
28. Google Webmaster
Tools Suite, Diagnostic
The interface recently received an overhaul, and Google Webmaster remains a must-have resource of diagnostic and health tools for site owners.
29. IFTTT
Productivity
IFTTT stands for IF This, Then That. The tool allows you to create automatic triggers between various apps, like Gmail and Twitter.
30. Infogr.am
Infographics
A great free Infographics resource that allows you to easily create graphics and data visualizations.
31. Internet Marketing Ninjas SEO Tools
Tools Suite
The Ninjas are some of the best SEOs and online marketers out there, and they've put some of their best tools online for free.
32. Linkstant
Link Building
This nifty analytics tool alerts you anytime someone links to your website. Great for outreach and intelligence gathering.
33. Linksy.me Email Guesser
Email, Link Building
Need to send an email, but you don't have the recipient's address? Type in what you know and this nifty tool will help you figure it out.
34. MailTester.com
Email
Need to send an email to an untested address, but you don't want to spam them? Check it first with this mail tester to verify.
35. MozCast
SERP Tracking, Moz
Want to know if Google is testing its algorithm this week? MozCast gives you a daily weather report to track changes in the SERPs.
36. MyBlogGuest
Link Building, Content
Guest blogging is still alive and thriving. MyBlogGuest helps you find the good opportunities out there.
37. Panguin Tool
Analytics
This awesome tool connects with your Google Analytics account to help you see if and when you've been hit by Google Algorithm updates.
38. Pingdom
Speed
Pingdom offers an entire suite of speed tools to help analyze page load, DNS issues, and connectivity.
39. Piwik
Analytics
Piwik is a lightweight web analytics solution, and a great alternative to Google Analytics.
40. Rank Checker for Firefox
Rank Tracking
This light and easy desktop tool checks rankings with the click of a button. Quick, easy and free.
41. Rapportive
Email, Link Building, Productivity
Rapportive works with your Gmail inbox to give you near-instant rich contact information for almost everyone you want to reach. A must-have for marketers.
42. Remove Duplicate Items
Productivity
Ontolo offers a suite of link building software and a few helpful productivity tools for link builders. The remove duplicates tool solves a common problem.
43. Robots.txt Checker
Robots.txt, Technical SEO
Use robots best practices and discover hidden errors in your robots.txt files that may cause search engine crawling problems.
44. Schema Creator
Structured Data, Technical SEO
Everyone loves using Schema.org, but the microformats are difficult to write by hand. This generator from the folks at Raven simplifies the task.
45. Scraper for Chrome
Productivity
If you've never scraped a webpage, you're missing out. Scraper for Chrome puts the power of simple web scraping in your hands without the need for code.
46. Seer Toolbox
Tools Suite, Analytics, Link Research
SEER opened up its internal toolbox for everyone in the world to use. These are the same tools used in-house at SEER, and they rock.
47. SEO Toolbar
Tools Suite, Toolbar, Technical SEO
On of the most popular tools available, The SEO Toolbar puts a ton of information at your fingertips including backlinks and competitive research.
48. SEO Tools for Excel
Tools Suite, Analytics, Social
You don't need to be an Excel ninja to use Niels Bosma's SEO Tools for Excel. This plugin does so many things many SEOs won't work without it.
49. SEOgadget Links API
API, Link Research
The SEOgadget Links API lets you easily gather not only backlink data but contact information as well. A huge time saver.
50. SEOgadget Tools
Tools Suite
This suite of tools from the Gadget lab includes several Excel plugins, a content strategy generator, and more.
51. SEOQuake
Toolbar, Tools Suite, Technical SEO
More raw data than any other SEO toolbar out there.
52. SharedCount
Social, Analytics
Want to know how any piece of content was shared socially across the major services? This is the tool to use.
53. SharedCount API
API, Social
Harnessing the combined statistics of Google+, Twitter, Facebook, and more, the SharedCount API puts a ton of social data at your fingertips.
54. Similar Page Checker
Content, Technical SEO
Use this tool to check for duplicate content issues. The Similar Page Checker will give you a score of how closely the HTML of two pages resemble each other.
55. Sitemap Generators
Sitemaps
Google offers a slew of free, top-notch sitemap generators. Most of these live on your server and generate new sitemaps automatically.
56. Social Authority API
API, Social
How much reach and social authority do your followers have? How about the people you're trying to connect with? The free Social Authority API will tell you.
57. Social Crawlytics
Social, Analytics
Social Crawlytics allows you to conduct competitive research by showing you your competitors' most-shared content. Lots of other features as well.
58. Social Mention
Social
Social mention offers real-time social media search and analysis. Enter a search term and see who's sharing what, right now.
59. Text Cleaner
Content
Some of the best tools solve the simplest problems. Text cleaner cleans up all kinds of text formatting when copying and pasting between aplications.
60. Ubersuggest
Keyword Research
Every SEO loves Ubersuggest for its ease of use and wealth of keyword research ideas. Utilizing the power of Google Suggest, it returns hundreds of potential results.
61. URI Valet
Technical SEO
A great tool for digging into server headers, canonical information, analyzing redirect problems and more.
62. Virante SEO Tools
Tools Suite
Virant offers a number of high quality SEO tools to the public. These are often the same tools developed for the Virant team, opened up for public use.
63. Wayback Machine
Competitive Intelligence
Want to see the history of your website or your competitor's site? The Wayback Machine allows you to step back in time and track important changes.
64. WebPagetest
Speed
Quick and easy website speed tool. Offers suggestions for improving performance.
65. Wordle
Content
Create beautiful word clouds. Great for visualizations, graphics, and research.
66. Wordstream Free Keyword Tools
Keyword Research, Tools Suite
In addition to its paid offerings, Wordstream offers a suite of free keyword tools offering access to thousands of keyword suggestions.
67. Xenu's Link Sleuth
Diagnostic, Technical SEO
Winner of the ugliest-SEO-tool-on-the-planet award, Xenu is also one of the most useful. Crawl entire sites, find broken links, create sitemaps, and more.
68. XML-Sitemaps.com
Sitemaps
XML-Sitemaps offers probably the easiest sitemap creation solution anywhere. Great for smaller sites when you need a sitemap in minutes.
69. Yahoo Pipes
Content, Productivity
A great mashup tool that combines different feeds into content and other magical creations. Used for link building and whatever you can dream of.
70. Yoast WordPress SEO Plugin
Technical SEO
If you could only choose one WordPress plugin for you site, the first would be from Yoast, and so would the second. This one sets the standard.
71. YouTube Analytics
Video, Analytics
Offers video-specific analytics for YouTube videos. A must-have for YouTube video publishers.
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