@Marcel_Gehlen@tchncs.de Maps is hard. There are OSM-based apps like @organicmaps but you won't be able to see your favourite restaurant reviews or advanced public transport navigation. It's a struggle.

About Gmail, I asked a similar question a while back, and @mailbox emerged as the winner https://social.juanlu.space/@astrojuanlu/110554471153598540 The web client is crap but you always have @thunderbird. I wish there was something closer to Hey dot com UX.

Drive - Pick a @nextcloud provider, for example @murena or https://github.com/nextcloud/providers#providers