Angel author here. It works very well for us and some others, but it must be said it is not as featureful as most of these. For example, it provides no assistance for log rotation (you'd need to do this via a shell pipeline with multilog or similar) and does not have a "control interface" (zmq socket etc) of any kind.
I think that logging should be separate here, so I'm actually okay with built-in logging support being minimal to nonexistent. If you use multilog (from daemontools) it will handle logging to rotated files; if you use svlogd (from runit), it can do the same, and also includes syslog support. If you just log to syslog in the first place, and your syslogd is at all modern, it can also handle writing things to log files, here or on a remote machine, which is cool too if you're okay with configuring it.
Or you can do something event more radical, like using fluentd[1], which looks really useful and well-designed. I like having this decision decoupled from the process manager. So, I would not count that as a strike against Angel.
Yeah, I agree. To this end, I just added support for specifying a logger process, and angel will now pipe stdout/stderr to it ala daemontools. Definitely don't want angel in the business of being a log rotator.
