IKI.AI
IKI.AI, or Intelligent Knowledge Interface, is a hosted workspace for collecting research and using AI to work with it. It targets professionals, students and teams with information scattered across documents, links and videos.
InfraNodus
InfraNodus is a text-analysis and knowledge-graph platform for researchers, writers, consultants and marketing teams. It turns documents and collections of ideas into interactive networks to reveal themes, influential concepts and gaps worth investigating.
Kosmik
Kosmik was a visual workspace for collecting research, organizing references and building moodboards on an infinite canvas. Its official site now announces a sunset date of 31 May 2026, so it should be understood as a winding-down product, not a currently supported recommendation.
Readwise
Readwise collects reading highlights and resurfaces useful passages for regular review. Its full subscription also includes Reader, a separate environment for reading and annotating source material.
Researchist
Researchist is an academic PDF reader for Mac, iPhone and iPad from Essayist Software. It connects paper reading, annotations and reference management.