Transportr is what you’re looking for.
Amazing. I shall contribute
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*last updated three months ago
not sure where you’re seeing this, latest release was in June, and the latest commit was three weeks ago.
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There is a link to their own F-Droid repo, also it is in Izzys repo iirc. Beta version works just fine imo, but I prefer öffi and use transportr only sonetimes when I’m in a new city
F-Droid says version 2.1.5 was released 2 months ago.
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While not a solution right now, I just want to add that the general transit feed spec aims to solve the data interoperability of different transit systems. The transit system keeps a publicly accessible zip file up to date, and then anyone can pull/parse the schedule/prediction data in a consistent way across transit systems. I know in the us adoption is slow, with vendors prefering to build their own walled gardens and transit agencies lacking the vocabulary or skills to advocate for more open data/tools
I used Öffi before too, but Transportr supports more countries and looks nicer imo :)
Transportr if you want detailed departure and arrival times. OrganicMaps for Google Maps replacement, lets you choose to route as pedestrian, via car or public transport (but only shows you one option and no departure times).
On mobile or desktop?
There is https://lemmy.world/post/1022670 that could answer your need
Most of these have no public transport, and osmands is in beta, also I need one on mobile on mobile
I recently moved from osmand to organic maps (now that they add gpx support) and even if it cannot be compared to gmaps it’s the most usable and have metro maps in it