Inkscape is an Open Source vector graphics editor, with capabilities similar to Illustrator, CorelDraw, or Xara X, using the W3C standard Scalable Vector Graphics (SVG) file format.
Xournal++ (a fork of Xournal) is a handwriting Notetaking software with PDF annotation support. Written in C++ with plattform independent GTK, supporting Linux, e.g. Ubuntu, Debian, Arch, Suse, macOS and Windows 10. Supports Pen input like Wacom Tablets.
Xournal++ vs Concepts opinions
There's a paywall for exporting it in SVG, PNG, PDF.
In Xournal++, you can increase the canvas size to any size you want. It is not unlimited size, but you can export it as a PDF, PNG, or even SVG.
Meet the freeform digital canvas where ideas, content, and people come together.
Lorien is an infinite canvas drawing/note-taking app that is focused on performance, small savefiles and simplicity. It's not based on bitmap images like Krita, Gimp or Photoshop; it rather saves brush strokes as a collection of points and renders them at runtime (kind of...
We believe artists deserve the best possible tools and we are determined to give it to them. The goal with Leonardo is to make the best painting application ever.
Bamboo Paper, a seriously fun new app from Wacom, provides you with the ability to create virtual notebooks for your tablet, letting you share your ideas visually with handwritten notes, sketches or doodles.
Plumbago reimagines the notebook! Plumbago is a digital notebook with handwriting smoothing, realistic ink, and paper, and more. Features include: