Free Software
OS
The Contiki Operating System - http://www.contiki-os.org/
Virtualization
libvirt - http://libvirt.org/
oVirt - http://www.ovirt.org/
Tools
PhotoRec - Digital Picture and File Recovery - http://www.cgsecurity.org/wiki/PhotoRec
Security
PuTTY: Free Telnet/SSH Client - http://www.chiark.greenend.org.uk/~sgtatham/putty/
WinSCP: Free SFTP Client for Windows - http://winscp.net/
Dropbear SSH Server and Client - http://matt.ucc.asn.au/dropbear/dropbear.html
MythTV
Home Page - http://www.mythtv.org/
Mythbuntu - http://www.mythbuntu.org/
Setting up MythTV in Israel - http://zeltak.com/k/Mythtv/
Setting up custom frequencies in MythTV - http://gyaan.blogspot.com/2007/12/mythtv-i-am-impressed.html
ACPI Wakeup for MythTV - http://www.mythtv.org/wiki/ACPI_Wakeup
Multimedia
Audacious Media Player - http://audacious-media-player.org/
youtube-dl - https://rg3.github.io/youtube-dl/
Computer Management
xCAT - http://xcat.org/
IPMItool - http://ipmitool.sourceforge.net/
Ganglia - http://ganglia.info/
How to Configure IPMI on RHEL - http://lonesysadmin.net/2007/06/21/how-to-configure-ipmi-on-a-dell-poweredge-running-red-hat-enterprise-linux/
Shopping
Tokyoflash - http://www.tokyoflash.com/en/
EDA / CAD
CadSoft Eagle
Main Page - http://www.cadsoft.de/
KiCad
KiCad Main Page - http://kicad-pcb.org/
KiCad Tutorials - http://kicad-pcb.org/help/tutorials/
Vintage Computers
PC
XTC Abandonware - http://www.xtcabandonware.com/
Retro "Homebrew" Computing:
RetroBrew Computers Wiki (some of the N8VEM project stuff moved here): https://retrobrewcomputers.org
N8VEM Google Discussion Group (redirects) - http://groups.google.com/group/n8vem
N8VEM Rolf Harrmann Page - http://hd64180-ecb.de/html/n8vem.html
N8VEM Rolf Harrmann Software - http://www.hd64180-z80180.de/html/software.html
Oscar Vermeulen "Obsolescence Guaranteed" Page - http://obsolescence.wixsite.com/obsolescence
RC2014 Homebrew Z80 Computer - http://rc2014.co.uk/
Simulators
The Computer History Simulation Project (SIMH) - http://simh.trailing-edge.com/
Altair 8800 SIMH Simulator - http://www.schorn.ch/cpm/intro.php
Thomas Scherrer Z80-Family Official Support Page - http://www.z80.info/
ZX81NV Micro Computer - http://www.user.dccnet.com/wrigter/index_files/zx81nv.htm
Z80 SBC - http://tinymicros.com/wiki/Z80_SBC
Cosam Z80 Project - http://www.cosam.org/projects/z80/
DYI Electronics
Online Stores
Jameco - http://www.jameco.com/
Futurlec - http://www.futurlec.com/
Digikey - http://www.digikey.com/
Mouser - http://www.mouser.com/
8051
AT89C2051 / DS1307 / LCD Clock - https://www.elektormagazine.com/magazine/elektor-200401/17654
AT89C2051 BlowIt Programmer (Linux) - http://www.lecad.uni-lj.si/~leon/electronics/bi2051/index.html
AT89C2051 GBI (GNU BlowIt) - http://gbi.sourceforge.net/
AT89C2051 BlowIt Programmer (WinNT) - http://www.geocities.com/dinceraydin/8051/
Easy-Downloader v1.1 - http://chaokhun.kmitl.ac.th/~kswichit/easy1/easy.htm
PIC
Practical Microchip PIC Projects - http://picprojects.org.uk/projects/picprojects.htm
8 Channel PWM LED Chaser - http://picprojects.org.uk/projects/ledchaserpwm/index.htm
LCD Display of Temperature - http://www.piclist.com/techref/piclist/cheapic/therm.htm
DYI LED Mood Lamp - http://tobe.nimio.info/led_mood_lamp.php
usbpicproc - USB PIC Programmer - http://usbpicprog.org/
Willem EPROM Programmer - http://www.willem.org/, http://www.geocities.com/mpu51/eprom/eprom.html
EEP: EEPROM Programmer for Linux - http://www.ibiblio.org/pub/Linux/apps/circuits/EEP-0.2.html
NerdKits - DYI LED Heart - http://www.nerdkits.com/videos/ledheart/
Traffic Light - http://www.eidusa.com/Electronics_Kits_TRAFFICER_01.htm
Making a Triode - http://paillard.claude.free.fr/
LED Torch - http://www.talkingelectronics.com/FreeProjects/LED-Torch/LED-Torch-P1.html, http://www.talkingelectronics.com/projects/LEDTorchCircuits/LEDTorchCircuits-P1.html
Matjaž Vidmar Page - http://www.s5tech.net/s53mv/index.html
Internet Tools
Google Translate - http://translate.google.com/
Translit - http://www.translit.ru/
Fun
Jokes and Stories
ibash.org.ru - http://ibash.org.ru/
bash.org.ru - http://www.bash.org.ru/
IT Happens - http://ithappens.ru/
Non-electronic DYI Projects
Sugar Candies - http://www.sugarindia.com/candy.htm, http://www.exploratorium.edu/cooking/candy/recipe-rockcandy.html
Разные штуки из бумаги - http://j3qq4-h7h2v-2hch4-m3hk8-6m8vw.ru/paper/
LiveJournal
My Friends Page: http://users.livejournal.com/_asm_/friends
Slashdot - News for nerds, stuff that matters - http://slashdot.org/
Study
Engineering
Stanford Engineering Everywhere - http://see.stanford.edu/SEE/Courses.aspx
Deutsch
Deutsche Welle - Deutschkurs - http://deutschkurse.dw-world.de/KursPlattform/WebObjects/KursPlattform.woa/wo/2.1
History of The Computing
History of The Web - http://www.whoishostingthis.com/resources/history-of-web/
History of the IBM PC - http://www-03.ibm.com/ibm/history/exhibits/pc/pc_1.html
History of Intel 8086 Processor:
Stephen Morse: Father of the 8086 Processor - http://www.pcworld.com/article/146917/article.html
Birth of a Standard: The Intel 8086 Microprocessor - http://www.pcworld.com/article/146957/article.html
The 8086/8088 Prime - http://stevemorse.org/8086/index.html
History of Zilog Z80 Processor - http://archive.computerhistory.org/resources/access/text/Oral_History/102658073.05.01.acc.pdf
Ken Shirriff's blog (reverse engineering and analysis of vintage processors) - http://www.righto.com/