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Example:
The ability to sort the priority of files in numbers descending or ascending. This was a very wanted feature in the community of Vuze and took too long time to develop but a simple plugin was a big help before adding it as a main feature since it's added immediately in the next update after the plugin is released.
autodl-irssi which is gui for irssi
cpuload which is cpu load indicator on the webui
diskspace which is disk space indicator on the webui
seedingtime which add another column called "Finished" and "Added" to the torrent list
theme which I guess is clear from its name

unpack which is designed to manually or automatically unrar/unzip torrent data
mediainfo which displays media file information in the webui !!!!
screenshots which tak screen shot from the video file in the webui !! allowing to show it and save it

cookies which provide cookies info for authintication on private trackers for direct download in many ways like magnet links or simply auto add the files
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SeedingTime as described above already exists as a feature i believe?
cpuload & discspace been added to the webui sounds like a neccessary feature and not a plugin to be completely honest.
Big +1 for theme support, i dont know whether this is actually viable as you'd be working with QT and i havent worked with QT before. I'd assume simple gradient recolourers and icon swaps possible.
unpack isnt really viable with qbittorent as its multiplatform.
You'd have to either pack gzip or something with the application or have it look for whats installed.
The run on complete commandline it has already allows this and more.
Mediainfo sounds like a useful feature, bit of bloat so i can see why it would be useful as an addon not coded into the actual client.
Screenshots plugin same as above
Idk how i feel about the cookies idea, seems less secure to me tbh that said i dont understand how it would be implemented, is it just a txtfile containing my key for the tracker, instead of the key been inside the tracker url?
[quote="Code"]
Another plugins are iTunes integration, IRC handling, Chat with peers, LAN peer finder and maybe even plugins allowing special update to the core of the app for some special patches, features.
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LAN Peer finder?? You mean LPD? Or does it do something else?
qbittorent is a pain in the ass to build under windows, you cant really update one componant without rebuilding the entire thing (its not a modular application in the sense an application like mirandi-im is)
Itunes integration?? what exactly does that entail? Isnt itunes smart enough to let me add a watched folder for it to automatically add stuff from to its internal library (windows bloody media player can do this)
IRC in my torrent client? Definantly a plugin...
Chat with peers sounds but useful the problem is the only peers i want to talk to arent actually peers, they're uttorent clients with the torrent on pause.
Anyway this frankly is a post/suggestion for the github tracker page not the support forum ;p.
https://github.com/qbittorrent/qBittorrent/issues