WinSCP can optionally search additional fields, like the username and notes:
https://winscp.net/eng/docs/ui_login#management

It would be interesting to have an improved site search in such a way that keywords could be written from the main screen, so that patterns should be included in the name or the properties of the site, such as the user, the notes, the protocol, etc.

For example, if I start typing "serv apach root" the site directory tree would show only those sites that match that search.