The list Index of Available Extensions contains currently about 150 extensions.
Taifun’s website App Inventor Extensions | Pura Vida Apps lists currently more than 625 extensions.
So this is always my first choice when looking for an extension.
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Wow, this is great! Thx for the information 
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Taifun is great
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Note: Taifun also records extensions that were not explicitly introduced or listed anywhere, but rather happened to arise from a specific problem.
The TextAlignment extension from @Boban is one such example:
Without someone reading almost every post on all AI2 distribution forums (as Taifun apparently does), such a complete list of extensions cannot be made at all.
Many thanks to Taifun for this first-class work, not only for his great website !
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