Micropress

micropress, n. 1. a gaming company that publishes one or two game systems or material related to a limited number of gaming milieux. 2. any small gaming company, whose products do not receive wide distibution and/or whose games are not well-known; implies low or questionable quality. [JPW]
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Addendum: Use of the term "micropress" implies that the publisher will not be (or was not) in business for very long (or is not yet well-known) and that their products are collectible to the right people. [JPW]
Addendum #2: The rise of d20 and the OGL spawned many, many new micropresses.