Which is the best example of COTS?

Could you please elaborate on what constitutes an ideal example of Commercial Off-The-Shelf (COTS) products in the realm of cryptocurrency and finance? Is it a widely adopted software solution that streamlines transaction processing, such as a blockchain platform offering secure and efficient smart contract execution? Or perhaps it's a pre-built financial analysis tool tailored for cryptocurrency markets, enabling users to make informed investment decisions with ease? Clarifying the criteria for an exemplary COTS product in this niche would greatly aid in understanding its application and value proposition.