FLDigi is described as 'Amateur Radio - Digital modem program for Linux, Free-BSD, OS X, Windows XP, W2K, and Vista. It covers PSK/RTTY/OLIVIA/CONTESTIA/THOR & THROB'. There are three alternatives to FLDigi for Windows. The best alternative is Logger32, which is free. Other great apps like FLDigi are Ham Radio Deluxe (Paid) and Digipan (Free).
Welcome to Logger32, a 32-bit Amateur Radio logging program written by Bob Furzer, K4CY. Bob is also the author of Zakanaka, and an older 16-bit version of Logger. Logger32 is currently supported to run under Windows 7, 8, 8.1 and 10.
Ham Radio Deluxe (HRD) is an integrated suite of software products for amateur radio. The five modules in the suite provide rig control,logging, digital communications, satellite tracking, and rotator control.