Is there an alternative to Network UPS Tools (NUT) for stand-alone systems?

Unless I read incorrectly, the minimum configuration for upsd [1] for a single system involves upsd listening on the loopback address and configuring a username/password for upsmon. I understand why these features make sense for a network with multiple machines, but I don't think it makes sense for a single system to involve network ports and authentication.

Ideally there is something like NUT but without the network component (a _UT?). Anyone know of something like that?

[1] https://networkupstools.org/docs/use...d/ar01s06.html

If you happen to have an APC UPS, apcupsd includes tools like apcaccess and apccontrol. Also, collectd has a plugin for apcupsd.