I'm familiar with:
- Stripe jQuery.payment.js (formance is based on this project, extended beyond payment forms) https://github.com/stripe/jquery.payment
- Masked Input (good for basic formatting, and does not include validating) https://github.com/digitalBush/jquery.maskedinput
- Validate.js (does not include formatting) http://rickharrison.github.io/validate.js/
EDIT: found it - http://jster.net/
There is also a really simple guideline to publish your plugin there: http://plugins.jquery.com/docs/publish/
Currently, there is no way to review which plugin is better. But at least it shows the number of watchers for each plugin, which can be an okay indicator whether a plugin is good or bad.
A good curation/ranking site for all of the various JS libs would be helpful.
Its wasteful for every developer to read the code of numerous JS libs just to figure out which one(s) was(were) written well.