We've discovered a new open source project (lead by "L1L1") that sounds promising.
Cardpeek is a Linux tool to read the contents of ISO7816 smartcards. It uses a PC/SC reader to communicate with the card, and its GTK GUI represents card data is a tree view. Cardpeek list of supported cards is expandable thanks to a scripting language. Currently, the tool can explore EMV cards, Calypso cards (including the Navigo pass from Paris area, with translation of the station names -this part developed by pterjan), Moneo cards (french ePurse) and Vitale (french health card).
Here's a few snapshot I've taken with a Prox'N'Roll PC/SC and my own Navigo card (Paris' Calypso card)
Selecting Prox'N'Roll PC/SC reader
Card content explained: ATR and list of contracts
Card content explained: transport log, with station code translated to actual names
Project homepage : http://code.google.com/p/cardpeek/
A few more explanations on freshmeat : http://freshmeat.net/projects/cardpeek