What are some alternatives?
When comparing Noise Blocker and NoiseGator, you can also consider the following products
Krisp - Mute the background noise during your calls
DeepSkyStacker - DeepSkyStacker is a freeware for astrophotographers that simplifies all the pre-processing steps of...
SoliCall Pro - Removes noise & echo from any VoIP call. Can also be used for call recording.
Siril - Siril is an astronomical image processing tool, able to convert, pre-process images, help aligning...
NoiseTorch - NoiseTorch is an open source app for Linux with PulseAudio. It creates a virtual microphone that suppresses noise. Use any conferencing or VOIP app you like and simply select the NoiseTorch Virtual Microphone as input to remove unwanted noise.
MyNoise - Custom shaped online noise machines. Many Many generic sounds