Knowflow

This product has so much potential but it hasn't been updated in two years. A lot of lag, lots of Russian language, and some strange UI quirks. A little development effort would go a long way to making this usable.

Great software tool ! I like the feature to nest cards into cards. In this way you can use and hide hierarchy in one map. I would pay for it. Without any information about future support / product life cycle I do not want to use it for personal knowledge management but I will keep an eye on it.

If you took time to get used to it's quirkness this is actually one of the most powerful knowledge management system. Unfortunately everything about this platform looks shady, since it is funded by Russian government. In conclusion, this app is a perfect place to put and organize very unstructured knowledge. But if you value your privacy it's better to not disclose any private info there.