Top 6 Open-Source Alternatives to PageArchiver

Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.

Quickly capture any webpage to OneNote where you can easily edit, annotate, or share it. Clip the full page, or clip only the article, recipe, or product information you really need.

Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, tagged and modified either from the applications directly or from your own text editor.

Leanote provides services for note and blog.

Trilium Notes is a hierarchical note taking application.

Cryptee is a safety and privacy focused, encrypted and cross-platform personal data storage service. You can write personal documents, notes, journals, store photos and all sorts of other files.