Information about programming microprocessors, particularly the Arduino.

Attic is a deduplicating backup program written in Python. The main goal of Attic is to provide an efficient and secure way to backup data. The data deduplication technique used makes Attic suitable for daily backups since only the changes are stored.
Currently Linux, FreeBSD and MacOS X are supported.

hardBackup is a powerful solution for disk-based backup on windows systems. By utilizing well proven open source technologies like Dirvish (link is external), Rsync (link is external), Openssh (link is external) and Cygwin (link is external), hardBackup can:

keep several images of backup in a rotating scheme
represent identical files in different images by one single physical copy
transfer only changes in files via secure channels

Put the security boundary where it ought to be.
userv (pronounced you-serve) is a program which, according to the specification, is
 a Unix system facility to allow one program to invoke another when only limited trust exists between them.

Found via the interesting "Experiences with Subversion" http://www.chiark.greenend.org.uk/~sgtatham/svn.html

Information about the TECO editor.
Found via http://home.windstream.net/engdahl/teco.htm
See also https://almy.us/teco.html, https://github.com/blakemcbride/TECOC and the home page of Dan Murphy, the author of the original TECO at http://www.opost.com/dlm/

A Bash one-liner to open the source code (in Debsources) of any file on your system (if it belongs to a Debian package).

xhyve is a lightweight virtualization solution for OS X that is capable of running Linux. It is a port of FreeBSD’s bhyve, a KVM+QEMU alternative written by Peter Grehan and Neel Natu.
The blog also has entries about 6502 assembly programming.

6502.org is a resource for people interested in building hardware or writing software for the 6502 microprocessor and its relatives.

We continually strive to remain the largest and most complete source for 6502-related information in the world. This includes everything from articles and project descriptions to schematics and source code.

Backup/restore to/from remote storage. Data is encrypted locally and de-duplicated to minimize the amount of data transferred.

V-USB is a software-only implementation of a low-speed USB device for Atmel’s AVR® microcontrollers, making it possible to build USB hardware with almost any AVR® microcontroller, not requiring any additional chip.