What are some alternatives?
When comparing Noise Blocker and DeepSkyStacker, you can also consider the following products
Krisp - Mute the background noise during your calls
Siril - Siril is an astronomical image processing tool, able to convert, pre-process images, help aligning...
NoiseGator - A simple noise gate app intended for use with VOIPs like Skype.
Iris - The fastest web framework for Go in (THIS) earth
SoliCall Pro - Removes noise & echo from any VoIP call. Can also be used for call recording.
PixInsight - A powerful deep sky stacking application for astrophotography.