I don't know if this counts but I really enjoy Notion [0]. We use it at work for developer guides but I also have a personal workspace where I keep notes and bookmarks, track my progress on goals and projects, and upload files for quick access across devices. Notion isn't perfect - I'd love recurring calendar events and overall performance could be improved - but for me it's so useful. I can open it from any device and start writing (think Simplenote) or build "micro apps" that perform some basic software function.

[0] https://www.notion.so