Notability is the handwritten-note benchmark from US-based Ginger Labs, launched in 2010 with 15M+ downloads, known for low-latency Apple Pencil writing, audio-synced recording and PDF annotation across iPhone, iPad and Mac.
Reeder is a classic Apple-ecosystem RSS reader from German indie developer Silvio Rizzi, known for minimalist elegant reading, iCloud three-device sync, and a one-time purchase model, supporting Feedbin, Feedly, and more.
Bear is an Apple-ecosystem Markdown notes app from Italian developer Shiny Frog, winner of the 2017 Apple Design Award, known for minimalist design and nested tags, with Pro at about $29.99/year.