TiddlyWiki is a fantastic, open source, hyper-extensible app which can also be a single html file. I have found it to be a joy to use and to adapt, and it has a friendly, helpful community of fellow enthusiasts behind it. For the past year or two, I've been using it principally to write and explore ideas on all kinds of topics, but it has also started to become the place I store contact details, track habits, plan my day, take reading notes, and learn through spaced repetition and retrieval practice. It is an incredibly versatile piece of software with fantastic hypermedia capabilities. THANK YOU to Jeremy Ruston for creating it, and to the super-helpful community which supports it, and which I learn from every week.
