The Mental Model Navigator is the result of many years of collecting interesting mental models (aka frameworks), i.e. theories, concepts, ideas etc. that can be used as lenses in looking at a problem and to identify solutions. It currently contains 500+ ideas and it is updated on an ongoing basis.

Unlike other collections of mental models, I have been very wide in my understanding of what can be considered a mental model. So beyond obvious tools (like the BJ Fogg behavioral model) and concepts like cognitive biases and business frameworks, I have tried to purposefully incorporate concepts coming from the arts and humanities (eg. the idea of sublime, Koan, cubism). These are usually not directly translatable into a "solution", but the idea is that they enrich the problem solver knowledge of different aspects of the world and, at the appropriate time, they may surface into consciousness and provide useful inspiration and novel metaphorical interpretations of reality. 

All concepts in the navigator are tagged (not really all: tagging is an ongoing work, please be patient) in many different ways, including by original field (physics, chemistry, art, etc.), level of analysis (things, agents, systems and meaning) and "idea width" (Theory, principle, method, concept). 
Concepts also have a description (typically from Wikipedia; sometimes formulated by me; sometimes inherited from Gabriel Weinberg or Gurwinder Bohgal, whom I tried to credit whenever possible in the "source" column), an image taken from Google images. Concepts are linked to each other as "related", and parent concepts are linked to their children (eg. "cognitive bias" is linked as father of "selection bias"). Finally, all concepts are scored by universality (how widely applicable the concept is) and "interesting rating" - my very subjective view on how commonsensical vs surprising a concept is.

Once more, all of this is work in progress, so there are many holes in the tagging, and more concepts can always be added. Also, credit may not always have been given where due, if you feel like you haven't been appropriately credited, please write me at kahan.jonathan [at] gmail [dot] com.
I may open up this database and make it a shared project at some point; meanwhile, if you have any mental model that you think should be added, please write me here kahan.jonathan [at] gmail [dot] com.

At this point I only need your email address because Airtable, on which the Mental Model Navigator is built, doesn't allow link sharing for interfaces.  By the way, you will need an Airtable account. 
I won't share the email address you leave here with anyone and I will only contact you if I have a very relevant update related to the Navigator or the Modeling in Problem Solving Project. Once you submit the form it may take up to a week until I add you to the Airtable base as I do this in batches.

Thanks!