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Signal
I've just gone to install Signal, and ironically baulked because it seems to want all of the permissions. I'm sure it is fine, but just seemed a bit ironic.
(Looking forward to getting 6.0 to have the app by app control over permissions)
branwen-
Signal is really secure, and a damn good replacement/add-on for SMS.
It does ask for a chunk of permissions, but most of these allow it to replace the existing SMS app fully, i.e. when you start a message that you can choose contacts, that you could share your location with a contact, that you could start a phonecall (dropping back to a regular call if the recipient isn't on Signal).
The guy behind it, Moxie, is one of the greatest coders of our time, and the entire codebase has been peer reviewed by people obsessed with security and privacy.
It's about as good as you're ever going to get to offering all of the features that they do for the least possible intrusion... but because of how Android assigns permissions it definitely looks intrusive.
Velocio
It's basically anything that has gone on the internet and could be considered to be public, or known somehow (metadata).
I figure, why shouldn't I benefit from such data, why shouldn't it all be in one place where I can search for stuff, and keep track of stuff?
That was the motive. Hence truly private stuff is not in it (Signal, things that happen at home and in private spaces), but anything that could be externally observed I track using lots of Calendars, and actually I've found a hell of a lot of value in doing so.