supervise monitors a service. It starts the service and restarts the
service if it dies. The companion svc program stops, pauses, or restarts
the service on sysadmin request. The svstat program prints a one-line
status report.

cyclog writes a log to disk. It automatically synchronizes the log every
100KB (by default) to guarantee data integrity after a crash. It
automatically rotates the log to keep it below 1MB (by default). If the
disk fills up, cyclog pauses and then tries again, without losing any
data.

accustamp puts a precise timestamp on each line of input. The timestamp
is a numeric TAI timestamp with microsecond precision. The companion
tailocal program converts TAI timestamps to local time.

usually watches a log for lines that do not match specified patterns,
copying those lines to stderr. The companion errorsto program redirects
stderr to a file.

setuser runs a program under a user's uid and gid. Unlike su, setuser
does not gain privileges; it does not check passwords, and it cannot be
run except by root.