Instant messengers
I have noticed that discord is listed for some official channels. Reading the privacy policy for discord I discovered that it basically flat out states that they collect your data and hand it out to third parties. To me this is unacceptable, so I found an alternative which was called Riot/Matrix. This messenger has now been renamed to "Element". After having used it for months I highly recommend it, it works well for one on one as well as group chats, natively supports encryption and has good privacy statements. My friends who introduced it to me still use it actively everyday.