GFS(Google File System):
http://www.codechina.org/doc/google/gfs-paper/

MogileFS:
http://www.danga.com/mogilefs

Hadoop/HDFS:
http://hadoop.apache.org/core

KFS(Kosmos Distributed File System):
http://kosmosfs.sourceforge.net

NDFS(Nutch Distributed File System):
http://lucene.apache.org/nutch/
http://wiki.apache.org/nutch/NutchDistributedFileSystem

Gluster(Gluster File System):
http://www.gluster.org

Coda(Coda File System):
http://www.coda.cs.cmu.edu/

Global(Red Hat Global File System Redhat并购):
http://www.redhat.com/gfs

Lustre(Lustre File System Sun并购):
http://www.lustre.org

PVFS(Parallel Virtual File System，非开源):
http://www.parl.clemson.edu/pvfs

GPFS(IBM General Parallel File System, 非开源):
http://www-03.ibm.com/systems/clusters/software/gpfs

OpenAFS(Open Andrew File System IBM):
http://www.openafs.org

XFS(SGI, 不算分布式文件系统):
http://oss.sgi.com/projects/xfs

MOSIX:
http://www.mosix.org

还有一个国内牛人写的FastDFS一个高效的分布式文件系统
http://code.google.com/p/fastdfs/