The most widely used FIR design method is the "Parks-McClellan" (or "equiripple") method. ScopeFIR provides two types of filter Specification Editors for this method. The first type is the Parks-McClellan Editor:

The Simple PM Editor can edit simple Lowpass, Highpass, Bandpass, and Bandstop filters.  Although it does not allow your to access to all possible Parks-McClellan specifications, it's easier to use for basic filter designs, which makes it probably the most widely used of all of ScopeFIR's specification editors.

The specification above illustrates a typical use, showing a lowpass filter with a 44.1 kHz sampling frequency, with 10 taps, having a 3 dB passband from 0 to 3 kHz, and a 40-dB stopband from 10 kHz to 22.05 kHz. (Note that for a lowpass filter, the Simple PM Editor assumes that the lower frequency of the passband is zero, and the upper frequency of the stopband is half the sampling rate.)

The second filter specification editor is the Advanced Parks-McClellan Editor:

The Advanced PM Editor is used primarily to design multiple-passband filters--although it also can be used to design single-passband filters, like the Simple PM Editor. Besides allowing you to enter any number of passbands and stopbands, the Advanced PM Editor allows you to specify certain additional parameters.  Also, it to design Differentiators and Hilbert transformers, which the Simple PM Editor cannot do.