macOS Quicklook plugins
Quick Look is a quick preview feature developed by Apple for the OS X system. It was introduced in Mac OS X 10.5 Leopard. By default the feature can be used by selecting a file and pressing the space bar.
Quick Look is also used to generate image thumbnails for files in Finder.
But some types of extensions do not have a build-in quicklook plugin, for instance MKV (matroska video) files don't have a build-in quicklook plugin, because of this Finder won't display thumbnails and quicklook won't load the video. Another example is markdown files, by default, the system cannot quicklook the file.
Without the plugin

With the plugin

How to install
Just copy the .qlgenerator plugin file to the ~/Library/QuickLook and restart Finder, or logout and log back in.
To restart Finder without logout open Terminal and type:
killall Finder
Then reopen Finder by clicking the Finder icon in the Dock.
Some Plugins:
QLMarkdown (.md markdown files)
https://github.com/toland/qlmarkdownQLColorcode (src files with syntax highlighting)
http://code.google.com/p/qlcolorcode/Quicklook-CSV (.csv comma-separated values files)
https://github.com/p2/quicklook-csvQLStephen (preview any plain text file)
https://github.com/whomwah/qlstephenQuickLookJSON (.json javascript object notation files)
http://www.sagtau.com/quicklookjson.htmlQLPrettyPatch (.patch path files)
https://github.com/atnan/QLPrettyPatchCompressed Archives (.zip .rar .7z etc)
http://macitbetter.com/BetterZip-Quick-Look-Generator/qlImageSize (improved preview with size and resolution)
https://github.com/Nyx0uf/qlImageSizeWebP (Google's .webp image files)
https://github.com/dchest/webp-quicklookBetterZip 3 (.pkg package files, trial app, but the plugin is 4ever free)
https://macitbetter.com/SuspiciousPackage (.pkg package files, trial app)
http://www.mothersruin.com/software/SuspiciousPackage/QLVideo (video files avi mkv webm flv etc)
https://github.com/Marginal/QLVideoProvisionQL (iOS macOS provision information)
https://github.com/ealeksandrov/ProvisionQLQuickLookAPK (android .apk package files)
https://github.com/hezi/QuickLookAPKQLMobi (Kindle .mobi ebook format)
https://github.com/bfabiszewski/QLMobiinddPreview (.indd InDesign, paid app)
https://itunes.apple.com/app/inddpreview/id1153435308?mt=12QLAddict (.srt subtitle files)
https://github.com/tattali/QLAddictElektriktrick (.stl, .dxf, and .gcode 3d files)
https://www.thingiverse.com/thing:376361QuickNFO (.nfo readme files)
https://github.com/planbnet/QuickNFOqlBitRate (display MP3 bit rate in the title bar)
https://github.com/jordansaints/qlBitRateePub (.epub e-book files)
https://github.com/jaketmp/ePub-quicklookQuicklook-IPA (iphone and ipad .ipa files, old but works)
https://code.google.com/archive/p/quicklook-ipa/ScriptQL (applescript files)
https://kainjow.com/qlDDS (direct draw surface 3d files) https://github.com/Marginal/QLdds
qlPlayground (.playground .swift Swift files)
https://github.com/norio-nomura/qlplayground
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