The best open source alternative to Microsoft Publisher is Scribus. If that doesn't suit you, our users have ranked more than 25 alternatives to Microsoft Publisher and three of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Microsoft Publisher are LibreOffice - Draw and Open Publisher.
Open-source desktop publishing software offering flexible layouts and typesetting, professional image setting, CMYK support, interactive PDFs, vector tools, and wide format support, perfect for creating newspapers, brochures, and more on Mac, Windows, Linux, and BSD.
Draw lets you produce anything from a quick sketch to a complex plan, and gives you the means to communicate with graphics and diagrams. With a maximum page size of 300cm by 300cm, Draw is a an excellent package for producing technical drawings, general posters, and much else.
Open Publisher is a lightweight, web-based desktop publishing tool that allows you to create documents, flyers, brochures, and fun designs on any device in any modern browser.
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It's nothing like publisher: it's very inflexible, the contrary of the drag-and-drop apps nowadays. Not fluent to work with even for texts, not at all for images. The use feels like 20 years back-in-time. In the very past, it will have been really nice, but now it's extremely outdated.