Pysync has both a demonstration implementation of the rsync and related algorithms in pure Python, and a high speed librsync Python extension. The pure Python is not fast and is not optimized, however it does work and provides a simple implementation of the algorithm for reference and experimentation. It includes a combination of ideas taken from librsync, xdelta, and rsync. The librsync Python extension is less flexible and harder to understand, but is very fast.
python-fchksum is a module used to find checksums of files (or stdin). It supports md5, crc32, cksum, bsd-style sum, and sysv-style sum. The advantage of using fchksum over the Python md5 and zlib(.crc32) modules is both ease of use and speed. You only need to tell it the filename, and the work is done by C code.
NBFW is a patch for Samba which allows a Samba server which is running on a masquerading firewall to masquerade netbios packets from a private LAN to a public LAN. With NBFW, computers on the private LAN show up in the browselists and can browse the public LAN. With sufficient OS support (such as Linux portfw or natd) it's possible to access the shares of the computers on the private LAN from the public LAN.
Samba TNG is a tiny SMB/CIFS suite (server, client, and utilities) for Unix-like operating systems. This software is concentrating on MSRPC interoperability with Windows NT, 2000, XP, Vista, 2003, and 2008. Windows 7 support is in progress. It provides PDC support and tools to remotely administer NT servers and workstations.
Sharity mounts shares exported by Windows, Samba, and other SMB/CIFS servers in the file system of Unix computers. It implements Resource Browsing, which is similar to the Windows Network Neighborhood (Netbios Workgroups and Active Directory), NTLM, NTLMv2, and Kerberos authentication, Microsoft's Distributed File System (DFS), and manipulation of Access Control Lists (ACLs).
Sharity-Light for Linux is derived from smbfs, but runs as a user level program, not in the kernel. It is roughly the opposite of Samba since it's a client for the Lanmanager protocol. Sharity-Light lets you mount drives exported by Windows (f.Workgroups/95/NT), Lan Manager, OS/2 etc. on Unix machines. The former name of this application was "rumba".