Our software addressing the topic of proteins channels and fragments detection is listed here:
MOLEonline
ChannelsDB 2.0
PatternQuery

MOLEonline 

MOLEonline web interface provides a direct access to MOLE functionality and enables on-line and easy-to-use interactive channel analysis. Read more in NAR.

ChannelsDB 2.0  

ChannelsDB 2.0 is a comprehensive and regularly updated resource of channels, pores and tunnels found in biomacromolecules deposited in the Protein Data Bank and AlphaFill / AlphaFold databases. As such, it is a unique service for channel-related analyses. Read more in NAR.

PatternQuery  

PatternQuery is an interactive, user-friendly, and platform independent web service enabling the user to effectively define, extract, and analyze structural patterns or biomolecular complexes using the PatternQuery language. Read more in NAR.