The IPDR.org reference libraries encode and decode IPDR usage documents in either XML or the binary format. Libraries are available in C and Java.
The Sleuth Kit is a C++ library and collection of open source file system forensics tools that allow you to, among other things, view allocated and deleted data from NTFS, FAT, FFS, EXT2, Ext3, HFS+, and ISO9660 images.
The DAFS protocol is a new file-access protocol designed to take advantage of emerging RDMA (remote direct memory access) interconnect technologies such as InfiniBand, VI and iWARP. See http://www.dafscollaborative.org/ for detailed DAFS information.
VILE is a high performance logging tool for C and C++ programs. VILE can be used for debugging or performance analysis.
Midea is a robust c string api set with regex support, handling fixed width 8 to 64 bit character sets at runtime (no recompilation is required). Initialization routines convert multibyte encodings such as utf8.
WebCheck is a simple device (computer, router, firewall) health status checking or monitoring over HTTP protocol. Very useful to keep track the status of of a multiple servers or workstation from remote location.