From FOSS alternatives listed there, LogSeq [1] looks quite promissing! It also mentiones canvas feature in their docs [2] (which are written as LogSeq graph, t

From FOSS alternatives listed there, LogSeq [1] looks quite promissing! It also mentiones canvas feature in their docs [2] (which are written as LogSeq graph, too). I am still evaluating it but so far so good, it even has an Android app (as a pre-release on GitHub). [1] https://logseq.com https://logseq.com [2] https://docs.logseq.com/#/page/whiteboard https://docs.logseq.com/#/page/whiteboard