Ext2Read is an explorer like utility to explore ext2/ext3/ext4 files. It now supports LVM2 and EXT4 extents. It can be used to view and copy files and folders. It can recursively copy entire folders. It can also be used to view and copy disk and file
Fuse-based cache file-system with support for disconnected mode, journal apply, refresh mode, multi-thread transfer and local directory structure cache.
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BDwrap is a template for writing stackable block device drivers on Linux. It's clean interface hides the complexity of device handling, asynchronous calls, buffer cache interaction, etc. It is a great tool to develop stacked block drivers quickly.
NFSProxy is a proxy for the NFS protocol. Its purpose is to cache the data which go through it, so files can be delivered far more quickly on a second read.
InterMezzo is a high availability file system with disconnected operation and persistent caching.
It exploits existing Linux file systems as the cache and has protocols similar to Coda.