Binders by Generism - High Level Database & Forms Application. An innovative solution to manage your database.
vym - VYM (View Your Mind) is a tool to generate and manipulate maps which show your thoughts.
ArangoDB - A distributed open-source database with a flexible data model for documents, graphs, and key-values.
Linked Ideas - A macOS/iOS apps to treat ideas as links of concepts.
Aibase - Creative Data Manager
Freeplane - Freeplane is a powerful and free software for building mind maps.