Plottr

Pros: It is easy to use.
It is fast.
It is very visual.
It has a lots of features (tags, categories, notes) that are flexible and adaptable to each project.

Cons: I can't figure out how to work efficiently online with other members of the team.
When the timeline has a lot of information sometimes it slows down (Im a Mac user) and maybe it.

Overall: I used it for story purposes but manly for research purposes.
It does the job better that any other software that I know.

Pros: Easy and intuitive. Love being able to use the story template of my choice and upload images and info for characters and settings. Being able to edit cards or move them around helps me to stay loose while setting things up without worrying over making a mistake. Tutorials are clear and simple, and there are many of them.

Cons: You do need to remember to save as you go. I have lost work before because I forgot to do this, but that was my mistake.

Overall: I know I'm not yet using this product to anything near its full capacity, but I'm enjoying using the features I'm familiar with and looking forward to learning more.

Pros: I really like the simplicity of Plottr. It brings structure and clarity to outlining in an easy way. Software can have a tendency to become bloated in the quest for being feature-rich. Plottr focuses on exactly one role, and then excels at just that.

The layout is easy to understand and it brings the feel of working with post-it notes or a whiteboard but on your desktop. Exporting to other applications is really easy when you are ready to dive into the detail.

Cons: There are some bugs - for example, in the new structure layout, making changes to some parameters makes the rendering break. But this is a small thing. It's difficult to pick out any cons beyond this because the feature set is actually quite light and, for once, it feels like a good thing.

Overall: So far, I have used Plottr for a number of different projects - to help outline a short story, to structure my personal and professional goals, to produce a high level work breakdown structure for a development project - and it has excelled at all of these.

The reason is because it focuses on doing the fundamentals really well, and avoids letting the noise of too many bloated features getting in the way. This is perfect, because there are other tools which can provide the next level of detail in your workflow, and Plottr exports really well to those.

The concept is simple, implementation is clean, and I couldn't recommend it enough if you are a fan of outlining or if you are looking for a tool to help you get there.