The best open source alternative to Cinnamon is KDE Plasma. If that doesn't suit you, our users have ranked more than 10 alternatives to Cinnamon and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Cinnamon are Xfce (Free, Open Source), GNOME (Free, Open Source), MATE (Free, Open Source) and LXDE (Free, Open Source).
Xfce (pronounced as four individual letters) is a free software desktop environment for Unix and other Unix-like platforms, such as Linux, Solaris and BSD. It aims to be fast and lightweight, while still being visually appealing and easy to use.
Many users of GNOME 2 dislike GNOME 3. MATE is a fork of the good old GNOME 2. It provides an intuitive and attractive desktop environment using traditional metaphors for Linux and other Unix-like operating systems.
Enlightenment is not just a window manager for Linux/X11 and others, but also a whole suite of libraries to help you create beautiful user interfaces with much less work than doing it the old fashioned way and fighting with traditional toolkits, not to mention a traditional...
Window Maker has a reputation for being fast, efficient and highly stable. Window Maker has been characterized as reproducing "the elegant look and feel of the NeXTstep GUI" and is noted as "easy to configure and easy to use.