This app was mentioned in 35 comments, with an average of 1.40 upvotes
You forgot "CalenGoo". This is the app with most functuality. You need some time to configure technically and optically.
https://play.google.com/store/apps/details?id=com.calengoo.android
Your first app "Business Calendar 2" does not offer week view in cells. Other apps do.
I prefer aCalendar Pro by far. A close second for me is Calengoo. Both of these have the correct and useful type of week view. Business Calendar's week view is pretty sad.
Calengoo and Pimlical calendars. Right now I use Calengoo but both of these calendars are way more powerful than all the pretty looking ones I always see mentioned in Calendar app suggestion threads.
My favorite feature, floating events, is a feature that every calendar should have in my opinion and these two are the only two that do it as far as I know.
Try Calengoo Been using it for a couple of months syncs with Google Calendar and Tasks. Tested it just now and it dose multi-level sub tasks it is one of the most customizable apps i have ever used.
Calengoo! it works very well on WearOs. Make sure you have tasks show in the agenda view. Then you can use the agenda on your watch and check off tasks!
I always bring up Calengoo in these types of threads. Been using it for like ten years and it's still getting regular updates. It's not the prettiest calendar, but everytime I get lured into trying some of the other more popular apps I come back to Calengoo because it's just so much more configurable and powerful.
If you care more about power user features than looks, then this calendar is where it's at. Not saying I don't wish it looked a bit nicer, but it's worth the tradeoff imho.
With such wallpaper it's indeed possible the whole thing is fake, where is the picture from?
Otherwise CalenGoo has an agenda widget with so many options that you could get something very similar.
Calengoo rarely gets mentioned in these threads because it's not as mainstream, but if you're a power user, you should strongly consider it as it is less pretty than some others but has more powerful features.
Calengoo
https://play.google.com/store/apps/details?id=com.calengoo.android
It might look a bit old school first, but you will see that there are tons of convenient features built in. Ah yes, last (beta) update yesterday. I keep switching back to it.
CalanGoo is my fav!
EDIT: What brought me to that one was the notifications from calendars. Use the calendar as an alarm. But the app ended up being so much more useful than that. Ton of features & really nice widgets. I used to use Business Calendar 1 or 2 with Calendar Event Reminder, but that stopped working reliably. CalanGoo does tasks really well too.
Now that that's covered, you'd have to go into a bit more detail about how you want alarms set based on your schedule. If you want an alarm a fixed amount of time before the "event", some programs will do that (e.g. CalenGoo), you don't need Tasker for that.
Calengoo? I've been using it for a couple of years and love it. https://play.google.com/store/apps/details?id=com.calengoo.android&hl=en
Pretty late to this party, but probably my most used and useful app is Calengoo.
It's not as pretty as some of the calendars out there, but gives you more control and advanced options than any other calendar (except Pimlical, which is a little too advanced IMO).
Two other useful apps that I use that start with C are:
Cerberus - I think most people are familiar
Contacts optimizer - Keep your contacts lists clean and organized by making bulk corrections/additions/removals.
Lots of features and widgets in calengoo
I like calengoo.
It's not open source and it's layout isn't the most modern, but I think it mostly fits your requirements.
How about Calengoo? But I can see individual tasks in the Google Calendar app too.
We use CalenGoo for calendars and tasks with Nextcloud:
https://play.google.com/store/apps/details?id=com.calengoo.android
Calengoo and Google Calendar.
Calengoo is a solid calendar app.
I have felt the same way too. For me there are three critical entities that I want to manage: Calendar, Tasks, and Notes.
I have settled on Google Calendar and Google Tasks after trying ToDoist, Toodledo and others.
Calendar
I have my work calendar (Windows 7/Outlook) sync'd to my Google calendar using Gsynchit. The synch is both ways and works great. For my mobile app (Android) I use Calengoo and LOVE IT. I have been using it for 2 years for so and have the paid version - definitely worth it for me. It has 2 way synch to my Google calendar, so any entry I make anywhere is quickly propagated to work desktop, home desktop, mobile.
Links
http://www.fieldstonsoftware.com/software/gsyncit4/
https://play.google.com/store/apps/details?id=com.calengoo.android
Tasks
I use Google tasks as the main entry to my ToDo list. Outlook is kind of lacking a coherent way (yet) to work with Google Tasks. Once again on Android Calengoo has Google tasks integrated into a tab of it's own and the ability to insert Tasks into the calendar. Again, these all sync invisibly to Google Tasks.
Notes
Well I have a great app on my Windows Desktop called Resophnotes. I can keep small text notes that I maintain in Dropbox and these synch across work and home. On my phone I have a good app called Draft which will let me view and add notes to this same folder in Dropbox. For me this is the personal database or place to store small bits of information I can quickly reference. I like the direction Toodledo is going to let you store notes and outlines. Still looking for an app like Resphnotes for Linux.
Links
http://resoph.com/ResophNotes/Welcome.html
EDIT: I also carry an pocket notebook for lists and to capture ideas.
Calengoo is great and syncs to to and from Google tasks https://play.google.com/store/apps/details?id=com.calengoo.android
Also Tasks: https://play.google.com/store/apps/details?id=ch.teamtasks.tasks.paid