Palm Desert, Calif. [DEMO 07] - Brevient Technologies on Tuesday released the public version of its Jyngle mobile group messaging service. The free service allows users to create and join unlimited groups for sports teams, volunteer organizations or even happy hour specials, and send and receive combined voice and text messages to all members of the group. Milwaukee, Wisc.-based Brevient said it will also market Jyngle to businesses for use as a promotional tool.