A new greek website has open these days. It is based on open source tools and public data. The Beta version is now running. You will find a retranscription of the creators’ explanation below.
“<http://www.geodata.gov.gr/> is (beta) up and running. “Public data, Open
data” is the motto.
For non-Greek speakers a sub-link perhaps worth looking at: “Χάρτες”(=maps)
. Services might be a bit slow since it partially runs on virtual machines
(keeping the budget low and use existing infrastracture).
- exclusively using open source tools:
Joomla, PostGIS, MapServer, OpenLayers, MapFish, GeoNetwork
- maps from:
Google Maps (sat. imagery), Το OpenStreetMap (maps), “Κτηματολόγιο Α.Ε.”
(aerial imagery) 
- coded in:
- Google Maps 
- OpenStreetMap 
- “Κτηματολόγιο Α.Ε.” (=Hellenic cadastre). Currently commercial use strictly
OpenAerialMap  was shut down and wasn’t realy comparable with the spatial
resolution of Google’s service.
Dear reader, I kindly ask you to forward the link to greek speaking users.
Kindest regards, Nikos
 Creative Commons Attribution-Share Alike 2.0 Generic License
2nd message from another founder:
“I am Spiros Athanasiou (spathan) and coordinate the design and development of geodata.gov.gr. Along with Prodromos Tsiavos (cc’ed) we have also prepared the corresponding legislative framework (Law on “National Infrastructure for Geospatial Information”).
Just wanted to contribute a (somewhat) better translation of the text included in the article. And of course apologize for not providing an English version ofgeodata.gov.gr! This is in our todo list for the next few months.
Also, I would like to mention that:
1. geodata.gov.gr will be officially announced in the Thessaloniki International Trade Fair this September (http://www.helexpo.gr/default.aspx?lang=en-US&loc=1&page=1642).
2. We will be organizing a hackathon for public data (details will be announced shortly).
3. Data from geodata.gov.gr are already used (i.e. re-used/purposed) from a number of Greek public bodies (unfortunately not allowed to disclose them at this point), saving the Greek Government so far roughly 6M euros in procurement costs alone (productivity costs are greater). As the service grows in size/quality and the number of participating public bodies increases, we expect this number to be significantly greater.
Should you have any questions, please don’t hesitate to contact me and Prodromos.
PS: Translation follows:
Q: Plenty of geospatial data that interest me and are of great value are missing!
We know this fact and continuously try to incorporate as much as possible data sets from the public administration. However, this task is more difficult than it sounds. Until recently:
There were no records of the geospatial data owned from the public administration. The Ministry of Environment, Energy and Climatic Change has already covered this gap, so we are now in position to know who has what!
There was no clear legislative framework on how the public administration offers its data. To be specific, certain public bodies marketed their data with arbitrary licenses and costs, even to other public bodies! In other cases, geospatial data were not available to third parties, other than the body that originally procured the data. All these issues are amended by the law on “National Infrastructure for Geospatial Information”, which has been prepared by the Ministry of Environment, Energy and Climate Change and will be signed by the entire Cabinet.
Q: I see that in certain cases, geospatial data have errors!
Unfortunately, we cannot do anything about this fact, other than to highlight existing problems that have accumulated to date. The public administration procured and produced geospatial data of poor quality. The law on “National Infrastructure for Geospatial Information” sets the necessary legislative framework so that from now on, we do not make the same mistakes. However, existing geospatial data, until they are corrected and replaced, will continue to have problems.
Here we ask for your help. Whenever you find problems and errors in the data, contact us. Soon you will be able through geodata.gov.gr to correct the data on the map!”