Applications that have been installed via Flatpak, just like those from other sources, will occasionally need to be updated. The Flatpak service can be used to keep your installed applications up to date. In this tutorial, you will see how to update all your Flatpak applications either individually or all at once on a Linux system.
Signal is a free and open source messaging application developed by the Signal Foundation: it is available on all the major operating systems such as Linux, Windows, Android and iOS, and supports all the major features one can expect, such as encryption, the ability to send files and make group calls. All the infrastructure behind Signal is open source, including the messaging protocol and the server software: the source code is available on github.
OnlyOffice is an open source office suite compatible with both open and proprietary documents formats. The suite includes applications to create and edit text documents, spreadsheets and presentations. The “community” version of OnlyOffice is cost-free and can be installed both as a service, or in the form of classic desktop editors.
PyCharm is a professional Python IDE (Integrated Development Environment) developed by JetBrains, which supports a lot of features like code completion, refactoring, debugging, etc. Two versions of the IDE exist: the “Professional” version, which must be purchased, and the free, “Community” version, which is based on open source software, and can be downloaded and installed free of charge. Various methods can be used to install the IDE on Linux.