Mine:
Eloris (UotA) Directory - http://eloris.math.aegean.gr/~tomkap/Homeserver (offline) - http://home.tomkap.gr/
PEBKAC Directory - http://users.pebkac.gr/~tomkap/
Phaethon (HPCS Lab) Directory - http://hpcs.epdo.teimes.gr/~tomkap/
Friends:
Alexander Weigl - http://www.awei.gr/Antonis K. Tzorvas - http://eloris.math.aegean.gr/~tzorvas/
Christos Karalis - http://users.pebkac.gr/~kingnothing189/
Dimitris Karagasidis - http://www.gatoni.gr/
Dimitris Tsironis - http://www.elegeiakaisatires.com/
George Lyras - http://aperturefever.wordpress.com/
Marios Tabakis - http://www.deradian.com/
Nikos Chatzidakis - http://www.nikhatzi.gr/
Nikos Efthimiou - http://users.sch.gr/nefth/
Rafael Bucio - http://bucio.com.mx/
Communities & Teams:
Anapnea Open-Ethical Network http://www.anapnea.net/AwareNetwork - http://www.awarenetwork.org/
CAU-GHQ - http://www.caughq.org/
C-Base - http://www.c-base.org/
Chaos Computer Club - http://www.ccc.de/
Debian Greek Community - http://www.debian.gr/
FOSS Aegean Community - http://foss.aegean.gr/
FreeBSD Greek Team - http://www.freebsdgr.org/
Gentoo Greek Community - http://www.gentoo-el.org/
IEEE Community - http://www.ieee.org/
TEIMES IEEE Student Branch - http://www.ieeesb.tesyd.teimes.gr/
TeSyD Student's Community - http://www.tesyd.net/
Patras Wireless Metropolitan Network - http://www.pwmn.net/
PEBKAC.gr - http://www.pebkac.gr/
Mailing lists:
Debian Greek Users - http://lists.debian.org/debian-user-greek/Gentoo Greek Users - http://archives.gentoo.org/gentoo-user-el/
OWASP Greece - https://lists.owasp.org/mailman/listinfo/owasp-greece
TEIMES IEEE S.B. - http://groups.google.com/group/teimes-ieeesb
Conferences, Events & Meetings:
CCC Events - http://events.ccc.de/FOSDEM - http://www.fosdem.org/
FOSSCOMM - http://www.fosscomm.gr/
OpenFest - http://openfest.teipir.gr/
ELLAKConf - http://conf.ellak.gr/
0x375 Meeting - http://www.0x375.org/
Websites & Blogs:
G. Margaritis Blog - http://gmargari.wordpress.com/Gentoo Users - http://www.gentoo-users.org/
IRC QuotesDB [GR] - http://www.qdb.gr/
XKCD Web Comic - http://www.xkcd.com/
Shops:
Aerial - http://www.aerial.net/BookDepository - http://www.bookdepository.co.uk/
E-Shop - http://www.e-shop.gr/
ThinkGeek - http://www.thinkgeek.com/