Lumped-Element Lowpass Filter Design

LPF Designer is a fairly extensive software tool for the design of lumped-element lowpass filters. It has all of the classical filter types available (e.g., Butterworth, Chebyshev I, Chebyshev II, elliptic, et.).

As helpful as the software design tool is, the documentation behind the tool is extensive, particularly as it pertains to elliptic filter design. If you are interested in precisely matching the tabulated values from Zverev, for example, this document is a helpful place to start.