Charles River Ventures

Founded in 1970, Charles River Ventures is one of the oldest and most
successful venture capital firms. Companies like Cascade, CIENA,
Chipcom, NetGenesis, Parametric Technology, Sonus, Speechworks, Stratus
Computer, Sybase, Vignette and dozens more have gone from idea to
reality with the financial, managerial and visionary backing of CRV.
The firm's investment returns are consistently among the highest of
venture capital firms, giving us one of the best track records in the
industry.

CRV offers a seed fund called QuickStart, where they do convertible debt up to  $250K.