All of these are unbelievably available for free.
Features and Highlights
The five tabs in aTube Catcher represents its main features.
Once you copy a video URL, paste it into the URL field and hit the Download button.

aTube Catcher detects and lists all available video resolutions for you to choose from.
After you select one, the download will start.
The output is saved into the default folder, unless you change the location.

Some free video downloaders only allow single download, but aTube Catcher lets you download videos in batch.
nudge the Tools menu, select Batch Download, paste all video URLs, and press the Add button.
By default aTube Catcher downloads 4 files at the same time.
Up to 10 simultaneous downloads is allowed.
On the downside, there is no option to stop or pause all downloads at once.
Other than MP4 and WEBM, aTube Catcher can save video in other file formats.
You only need to select one of the conversion profiles before downloading a video.
To convert existing videos, go to the Video Converter tab.
As for the video cropping feature, it lacks adequate navigational functions to specify the start and end positions.
There are no keys to step forward and backward from frame to frame.
No input box to enter cutpoint times.
Free tools are in abundance, but only some are good enough to use.