As regards replacing Evernote, there is already the very capable and stable Zotero[1], which provides source to roll your own server[2]. It integrates well wit

As regards replacing Evernote, there is already the very capable and stable Zotero[1], which provides source to roll your own server[2]. It integrates well with LibreOffice and LaTeX/BibTeX. It does nothing to address the anonymous or secure aspects however. 1. https://www.zotero.org/ https://www.zotero.org/ 2. https://www.zotero.org/support/dev/dataserver_setup https://www.zotero.org/support/dev/dataserver_setup