add links to other Jackson binary format backends

Author: cowtowncoder

README.md

@@ -18,6 +18,16 @@ All modules are licensed under [Apache License 2.0](http://www.apache.org/licens
 
 [![Build Status](https://travis-ci.org/FasterXML/jackson-dataformats-binary.svg)](https://travis-ci.org/FasterXML/jackson-dataformats-binary)
 
+## Other Jackson binary backends
+
+In addition to binary format backends hosted by FasterXML in this repo, there are other
+known Jackson backends for binary data formats.
+For example:
+
+* [bson4jackson](https://github.com/michel-kraemer/bson4jackson) for [BSON](http://en.wikipedia.org/wiki/BSON)
+* [EXIficient](https://github.com/EXIficient/exificient-for-json) for [Efficient XML Interchange](https://en.wikipedia.org/wiki/Efficient_XML_Interchange)
+* [jackson-dataformat-msgpack](https://github.com/msgpack/msgpack-java/tree/develop/msgpack-jackson) for [MessagePack](http://en.wikipedia.org/wiki/MessagePack) (aka `MsgPack`) format
+
 ## More
 
 See [Wiki](../../wiki) for more information (javadocs).