Payment gateways:

Newsflash: This Magento payment extension is designed for making credit card payments through Winbanks (Piraeus bank) paycenter system (Greece). This payment gateway uses the redirect method where the use...
Newsflash: This osCommerce payment module is designed for making credit card payments through Winbanks (Piraeus bank) paycenter system (Greece). This payment gateway uses the redirect method where the user...
Newsflash: This Prestashop payment module is designed for making credit card payments through Winbanks (Piraeus bank) paycenter system (Greece). This payment gateway uses the redirect method where the user...
Newsflash: This Ubercart payment module is designed for making credit card payments through Winbanks (Piraeus bank) paycenter system (Greece). This payment gateway uses the redirect method where the user i...
Newsflash: This Magento payment extension is designed for making credit card payments through Eurobanks API Proxypay system (Greece). This payment gateway uses the direct Proxypay API method where the use...

Payment gateways compatible with Magento 1.2 - 1.4 have been developed an can be downloaded from this site:

Downloads (approved registered users):
File	Description	File size	Last Modified
Deltapay (Alphabank)	Deltapay v102 (redirection)	23 Kb	17/07/10 17:28
EFG Eurobank Ergasias	Eurobank ProxyPay3 API v102	18 Kb	23/03/09 11:59
EFG Eurobank Ergasias	Eurobank ProxyPay3 v102 (redirection)	24 Kb	17/07/10 17:28
Winbank	Piraeusbank v1.0.5 (2010) redirection	19 Kb	17/07/10 17:29