Taskulu has a sharing option for tasks. its for sharing a task with someone out of the project.
You can open a task and share it from "More Options" as you can see below:
If you write the email, link of the task will be sent directly to that email address.
otherwise you can save the link by clicking on it and send it by the way you like.
If you check the "Anonymous Access" box, the pesron you shared the task with could see the task without signing in Taskulu website. If you don't check this box, they should sign in to see the tasks you've shared with them.
When you click on the link that sent for you and you dont be login you will see this:
and you can also download task's files.
If you log in and click on the link you can send comments too.