On Apr 23, 2014, at 9:02 PM, Cl��ment Bera <bera.clement@gmail.com> wrote:

Gemstone is also used quite often for large scale application but Gemstone is not free.

GemStone/S 64 Bit is used for both large and small applications, and GemStone/S 64 Bit has a free for commercial use license available (see��http://seaside.gemtalksystems.com/).