The developers from Browserling decided to lay out for public use (for open source)
90 modules for Node.js. All of them are posted on github and are well documented.
Most of the modules are small useful utilities, but some are a significant contribution to the Node.js community. For example,
node-bigint is a very reliable and efficient library for arbitrary precision arithmetic.
Browserling is known as the developer of
one of the best web services for cross-browser testing sites. At first they did it on Haskell, but a couple of years ago they switched to Node.js. Someone says that
these guys are a year or two ahead in terms of the level of development of everyone who works in this field.