As a public service (and frankly just because I want to) I am going to start listing startup rocket companies I am contacted by. So starting with the one I am involved with.
Solar Skiff :
Solar Skiff is a company, a craft, and a concept. It is a simple idea to explore the Solar System with reusable spaceships manned by explorers and colonists from the planet Earth. The company, Solar Skiff, will help make this happen by building reusable single-stage-to-orbit (SSTO) spaceplanes. The long-term goal is to develop versatile spaceships and associated mission architectures enabling routine manned spaceflight throughout the Solar System. You can take part in this adventure.Microlaunachers:
The Wright Brothers were not at first trying to set up a business. They were trying to build an airplane.
Microlaunchers is an attempt at a third approach to developing space access: to, with miniature size and budget, develop a vertically integrated spacecraft launch/deployment system.