I'm a fan of the d20 Modern system, however I have never really been a fan of the classes that are in the book. The generic classes just never lit a fire under me enough to make me be able to really get into the system.
To that end, I am working on a line called Class Alternatives for Battlefield Press, Inc. that will be able to be used in place of the classes that are standard to the d20 Modern system. These are not new Advanced Classes, or Prestige Classes, or anything like that. These are fully functioning 20-level classes designed specifically for use in modern campaigns. Most of these classes will be designed around Pulp, "Neo-Pulp," or other adventure fiction archetypes. Each class will be completely self-contained, all that will be needed to bring that character into play in your d20 Modern campaigns will be the core rules and a copy of the class that is wished to be used by players.
As these are still in development, page counts are not exact but each Class Alternative will have all of the information on the class, any new or altered Skills and Feats and appropriate Occupations for that character class. Each Class Alternative will be fully compatible with your d20 Modern campaign, but not necessarily with characters created using the standard d20 Modern rules. Right now, classes in development are the Challenger and the Empowered.
A part of Battlefield Press, Inc.'s Modern Options line, the Class Alternatives bring new concepts, options and ideas to your d20 Modern campaigns.