Prompt desktop application for Task Management

Question

CMS

Before that, I used Google Tasks, but now there are so many things to do that it’s already inconvenient to use them effectively. I, of course, will also look for it myself, but I need, as they say, yesterday, so I don’t want to step on a rake, but ask for advice.

Briefly, what is required:

I have many projects that involve planning and doing experiments, measurements, working with manuscripts, and so on.
Therefore, you need a convenient application where all these tasks can be recorded, assigned importance, due date, displayed in a convenient form in something like a calendar, a list of tasks for today, something like this.

What Google Tasks does not suit is that it cannot be divided into projects (if only on separate sheets, but this is inconvenient), it is impossible to assign importance, it is practically impossible to display it on the calendar in a convenient form (in fact, it is possible, but it is somehow flawed), you cannot add a collaborator etc...

The application must be open-source - I can't install pirated software on a working computer :(

I would be grateful to everyone for the tips!

Answer 1

use planfix.

Answer 2

i.doit.im/
www.6wunderkinder.com/wunderlist/
The functionality is about the same, choose to taste. Both are free.

Answer 3

The coolest thing in my opinion thn.gs

Answer 4

I really like ToDoList from AbstractSpoon, there is a breakdown into projects, priorities and due date too.
It's definitely free, and even kind of open source)

Answer 5

Emacs org-mode. Seriously, I've never seen better.