Open-source operating systems are ruling the world of mobile and android is still one of the best sources. There are many bundles that are being prioritised for the software which comes alongside with the other devices. There are many open-source mobile OS alternative to android, which can help keep you on the top.
Tizen is open-source which is based on the Linux mobile operating system. Tizen is a project which is supported by tech giants Samsung and Intel. It is one of the best and the first as they also launched a Tizen phone. Despite the technology being based in Linux Tizen OS has been marked as having a lot of security issues which caused the software to be pulled out for the project.
Plasma mobile is the mobile version of the desktop, which with the help of the interface aims at trying to provide for the right KDE users. There is an OS development which allows being tested on a few devices. This is an open-source mobile OS operated by KDE.
PostmarketOS is a touch optimised, pre-configured Alpine Linus which with its own packages can easily be installed on smartphones. The idea is to make the lifespan of the mobile for more than ten years. Android and iOS will also be providing many updates for older smartphones. As they can also run the Linux on older computers easily. PostmaketOS wants to achieve the same platform but for mobile by tweaking the Linux into a touch optimised platform. As PostmarketOS has an early phase of development, this is one of the best ways to use regular smart phones.
Ubuntu Touch by UBports
The king of desktops world the Linux can be expanded into its territories with its open-source mobile operating system. There are many convergences that are kept in mind which was later launched at $32 million crowdfunding campaign to built the first phone, Edge.