| API | Description | Category | Date |
|---|---|---|---|
| Answerbag | Questions and answers service | Answers | 2007-02-15 |
| Ask SciPy | Collaborative question and answer software | Answers | 2011-06-30 |
| Ask500People | Crowdsource polling service | Answers | 2011-12-23 |
| ChaCha | SMS question and answer service | Answers | 2010-02-24 |
| Dooblet | Alternatives discovery services | Search | 2008-11-21 |
| Formspring | Q&A social network | Answers | 2011-09-02 |
| HealthTap | Online health network service | Medical | 2011-12-06 |
| hiogi | Questions and answers service for mobile | Answers | 2008-08-09 |
| Hunch | Questions and answers service | Answers | 2009-06-18 |
| Loquest | Question and answer service by location | Answers | 2011-09-08 |
| Omgili | Search service for user generated content | Search | 2009-09-25 |
| PollBob | Poll and survey service | Answers | 2011-10-25 |
| Qhub | Questions and answers service | Answers | 2010-03-26 |
| Questsin | Thesaurus and answers lookup services | Answers | 2008-12-27 |
| Quetter | Social Q&A website | Answers | 2011-06-20 |
| Quora | Question and answer site | Answers | 2011-01-10 |
| RealtyBaron Answers | Real estate question and answer service | Real Estate | 2010-03-29 |
| SnappyFingers | Question and answer search engine | Search | 2008-12-05 |
| Stack Overflow | Programming question and answer site | Answers | 2010-06-14 |
| True Knowledge | General question and answers service | Search | 2007-12-06 |





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