| API | Description | Category | Date |
|---|---|---|---|
| Yandex Webmaster | Yandex-specific search engine optimization tools | Internet | 2013-02-25 |
| PostLinks.com | Link building service | Internet | 2012-12-12 |
| Sistrix | Website optimization service | Internet | 2012-11-28 |
| SEOlytics | SEO analytics software | Advertising | 2012-10-05 |
| SEOshop WebshopApp | Search engine optimized webshop service | Retail | 2012-08-09 |
| Twingly | Blog Search Service | Blogging | 2012-07-26 |
| Regator Semantic | Content aggregator and analysis service | Internet | 2012-07-23 |
| eCoComa Marketing | Online marketing service | Advertising | 2012-05-15 |
| Analytics SEO | SEO optimization service | Search | 2012-03-07 |
| Link Emperor | SEO campaign management service | Internet | 2012-01-31 |
| SEO Engine | SEO improvement and implementation service | Internet | 2012-01-30 |
| Directory Maximizer Directory Submissions | SEO Link Building Service | Search | 2011-09-27 |
| Masspublisher | Website and widget publishing and marketing service | Internet | 2011-08-15 |
| SEOBudget | Search engine promotion valuation service | Tools | 2011-08-15 |
| WebSEOAnalytics | SEO analytics service | Internet | 2011-08-15 |
| SetLinks | SEO link buying service | Internet | 2011-07-26 |
| AuthorityLabs Account | SEO Rank checking service | Internet | 2011-07-26 |
| Daum Context Keyword | Contextual keyword extraction service | Tools | 2011-07-12 |
| Scribe | SEO improvement service | Blogging | 2011-07-12 |
| Majestic SEO Enterprise | SEO intelligence service | Enterprise | 2011-05-25 |
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