Flatpak
Flatpak is a packaging format for linux. And the best part, it is supported on all major linux distros. If you distro doesn't have flatpak installed by default you can go to https://flatpak.org/setup/ and follow the instructions there according to your disto. Few other advantage of flatpaks include shared dependencies, permission manager etc.
Here is a list of pretty useful (flatpak) Softwares for linux.
1) Blanket
Its a really nice application that plays ambient sound when you need to concentrate or study. It has a lot of options to choice from.
To install it, just type the following command in the terminal
flatpak install flathub com.rafaelmardojai.Blanket
2) Freetube
This application can be a bit controversial. Its basically a youtube client. It Provides adfree playback, custom speed, download videos and a lot more features.
To install it, just type the following command in the terminal
flatpak install flathub io.freetubeapp.FreeTube
3) KTouch
This is a really awesome software if you want to learn touch typing.
To install it, just type the following command in the terminal
flatpak install flathub org.kde.ktouch
4) Frog
Frog is a really nice and accurate OCR software, it also supports qr code.
To install it, just type the following command in the terminal
flatpak install flathub com.github.tenderowl.frog
5) Solanum
Its a pretty simple applicatiion for pomodoro technique.
The Pomodoro Technique was developed in the late 1980s by then university student Francesco Cirillo. Cirillo was struggling to focus on his studies and complete assignments. Feeling overwhelmed, he asked himself to commit to just 10 minutes of focused study time. Encouraged by the challenge, he found a tomato (pomodoro in Italian) shaped kitchen timer, and the Pomodoro technique was born.
^Wikipedia
Pomodoro is a really nice productivity technique.
To install it, just type the following command in the terminal
flatpak install flathub org.gnome.Solanum
These were 5 softwares that I found really Interesting and use on regular basis. To discover more flatpak softwares, you can head over to Flathub.