MapReduce Implementations

Hi everyone, here are all MapReduce implementations I found online, all of which are either an independent Mapreduce Framework or coupled to a database or file system, a single programming language or a single domain, or made as a library or implement only a subset of mature MapReduce features. Hope this list might be helpful. 

Hadoop
Hadoop mapreduce	The most commonly used open source Mapreduce implementation by Apache	http://hadoop.apache.org/
Other Mapreduce Implementations
Disco	Mapreduce implementation in Erlang developed by Nokia	http://discoproject.org/
Cloud MapReduce	MapReduce implementation on Amazon Cloud OS	http://code.google.com/p/cloudmapreduce/
Mincemeat	Python implementation of the MapReduce distributed computing framework	http://mincemeatpy.com
Mapredus	simple mapreduce framework using redis and resque	http://rubygems.org/gems/mapredus
Qizmt	MySpace’s Open Source Mapreduce Framework	http://code.google.com/p/qizmt/
Peregrine	Fast Mapreduce framework for running iterative jobs across partitions of data.	http://peregrine_mapreduce.bitbucket.org/
HTTPMR	Scalable data processing framework for people with web clusters.	http://code.google.com/p/httpmr/
R3	Mapreduce engine written in python using a redis backend.	http://heynemann.github.com/r3/
Octopy	Fast-n-easy MapReduce implementation for Python	http://code.google.com/p/octopy/
Bashreduce	Implementation of MapReduce in the bash shell	http://blog.last.fm/2009/04/06/mapreduce-bash-script
Starfish	Open source ruby implimentatoin of mapreduce	http://rufy.com/starfish/doc/
Skynet	open source Ruby implementation mapreduce created at Geni	http://skynet.rubyforge.org/
FileMap	system for applying Unix-style file processing tool and provides full map-reduce functionality	http://mfisk.github.com/filemap/
Meguro	simple javascript Map/Reduce implemention	http://www.sevenforge.com/meguro/
Mapreduce-lite	lightweight C++ implementation of the MapReduce	http://code.google.com/p/mapreduce-lite/
Misco	Mobile Mapreduce framework	http://www.cs.ucr.edu/~jdou/misco/
Galago's TupleFlow	search engine toolkit which distribute execution across many processors	http://www.galagosearch.org/guide.html
GPMR	Multi-core GPU mapreduce on GPU clusters	http://www.idav.ucdavis.edu/research/projects/mgpu_mapreduce
Hadoop Pipes	Hadoop C++ API for mapreduce	http://code.google.com/p/hadoop-stream-mapreduce/
Haloop	modified version of Hadoop support efficient iterative data processing	http://code.google.com/p/haloop/
Mapreduce for storage and file system
Sphere	distributed data storage use Mapreduce	http://sector.sourceforge.net
MongoDB	Map/reduce database for batch processing of data and aggregation operations	http://www.mongodb.org/
Greenplum	Next-gen data warehousing and large-scale analytics processing database Supporting SQL and MapReduce parallel processing	http://www.greenplum.com/
Plasma MapReduce	Distributed filesystem, key/value db, and map/reduce system	http://projects.camlcity.org/projects/plasma.html Riak
Riak	open-source, distributed database using mapreduce for Searching and Aggregating Data	http://wiki.basho.com/
Grid Grain	map reduce open source data grid	http://www.gridgain.com/
InfiniDB	open-source free analytical (columnar) DB  implements MPP in a MapReduce-like fashion	http://infinidb.org/
CouchDB	Database use Json for ducuments and javascirpt for mapreduce queries	http://couchdb.apache.org/
Mapreduce librarires
Boost	Boost C++ library for mapreduce	http://www.craighenderson.co.uk/mapreduce/
Haskell-MapReduce	MapReduce library for  Haskell	https://github.com/Julianporter/Haskell-MapReduce
MPI-MR	Mapreduce-MPI library	http://www.sandia.gov/~sjplimp/download.html