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Reynard Corporation defines beamsplitters in one of three main categories:

Neutral: Amplitude is divided into two parts – a transmitted component and a reflected component – and is generally specified by the ratio T:R at a specified wavelength or spectral range.

Dichroic: Wavelength range is divided into two or more parts – with some wavelengths transmitted and others reflected.  Sometimes categorized as edge filters used at non-normal incidence.

Polarizing: Amplitude and/or wavelength range is divided based on polarization.  Specifications typically require definition of ratio between polarizations (P + S) at specified wavelength or wavelength range.

More technical information on beamsplitters.