Lists are always made of the best apps for…, the best GNU / Linux distributions, etc. But why not a list of worst apps for GNU / Linux? That can also be positive, causing users to avoid certain projects that are not good for one reason or another, or that are not really practical.
If you want to know which are the worst applications, or the most useless, that you can install (or that were available at the time) in your favorite distribution, here is a list with the top 10:
The worst Linux apps ...
Firefox Extension Manager
Mozilla has created one of the best web browsers, and the favorite of many. Firefox however, its extension manager has caused many problems in the past, rendering many of them unusable when they are updated. Fortunately, the developers have been working on that to improve.
Cheese
It comes pre-installed on distros like Ubuntu. But ... does anyone really use these apps? It's supposed to be for the webcamHowever, it has had some errors that have made many users desperate, such as segmentation failures, slowness, among others.
Istanbul
It was popular, although there are already many superior alternatives for record desktop on Linux. One of the most powerful alternatives is the famous OBS. Also, this software did not work fine (especially in the Unity era when it was not supported), and many users who installed it ended up making use of other projects such as Kazam, Vokoscreen, etc.
HasciiCam
It is one of those little apps to create video effects, but that it was not very functional and complete. On many occasions I recognized the webcam well, but the configuration options were a bit questionable, and sometimes errors resulted in the video not being recorded.
Lombard Video Editor
It is a video editor that was not a success either. It is true that it was light, but it missing a multitude of functions so it's really practical for your rush. Basically it was limited to a tool to cut video and with the ability to export.
Miro
Other acquaintance TV app on Linux. It allows watching television channels over the Internet and was based on the Firefox browser. However, it doesn't work quite well, and there are still links to Flash-based channels (incompatible) sometimes, as well as being confusing for beginners, etc.
Home Bank
One of those apps that seem too primitive as for this time. A very basic financial software with some bugs that scared users away. With an outdated GUI, and screaming for a makeover.
Gnome Nanny
A system parental control pretty nefarious compared to other projects of the same type. It is true that it allowed to load preconfigured rules to prevent access to certain websites, time control, etc., but it had a somewhat crude interface, it blocked some things, and if you tried to uninstall it blocked all web access ...
gromit
Finally, another of those unsuccessful apps was Gromit. Created for annotations using a graphics tablet. However, it failed on some occasions.