This seems like a decent option, although it has bugs coming in and out all the time! Also it is quite hard to learn to use.

To get started:

import a clip
drag it onto the track area

Shortucts:

Shift + R: cut tracks at current point. You can then select fragments to move around or delete.
Shift mouse click drag: select multiple clips: video.stackexchange.com/questions/21598/select-range-of-clips-in-kdenlive

To set the video length, search for "set outpoint" on "monitor".

Add subtitles:

Effects
Dynamic text

then drag on top of the video track. To add only to part of the video, cut it up first.

Preview has no sound on Ubuntu 20.10. Fixed as of Ubuntu 22.04.

Sound worked on Ubuntu 21.04 though, but it then soon crashed with:

 = = SET EFFECT PARAM:  "rect"  =  0=1188 0 732 242
MUTEX LOCK!!!!!!!!!!!! slotactivateeffect:  1
// // // RESULTING REQUIRED SCENE:  1
Object 0x557293592da0 destroyed while one of its QML signal handlers is in progress.
Most likely the object was deleted synchronously (use QObject::deleteLater() instead), or the application is running a nested event loop.
This behavior is NOT supported!
qrc:/qml/EffectToolBar.qml:80: function() { [native code] }
Killed

amazing.

On Ubuntu 22.04 haven't crashed yet.

Ubuntu 23.04 broke the clip drag and drop!

ShotCut

0 0

Worked on Ubuntu 20.10.

The UI is a bit too buggy to bear.

How to unsplit, can't find on shotcut 21.05.01: forum.shotcut.org/t/is-it-possible-to-unsplit/1466/2

Background noise reduction: couldn't easily find out how, especially with automatic profile detected based on a selected region as mentioned at audacity profile-based background noise removal:

OpenShot

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Ubuntu 20.10 crash...:

  exceptions:ERROR Unhandled Exception
Traceback (most recent call last):
  File "/usr/bin/openshot-qt", line 11, in <module>
    load_entry_point('openshot-qt==2.5.1', 'gui_scripts', 'openshot-qt')()
  File "/usr/lib/python3/dist-packages/openshot_qt/launch.py", line 97, in main
    app = OpenShotApp(argv)
  File "/usr/lib/python3/dist-packages/openshot_qt/classes/app.py", line 218, in __init__
    from windows.main_window import MainWindow
  File "/usr/lib/python3/dist-packages/openshot_qt/windows/main_window.py", line 45, in <module>
    from windows.views.timeline_webview import TimelineWebView
  File "/usr/lib/python3/dist-packages/openshot_qt/windows/views/timeline_webview.py", line 42, in <module>
    from PyQt5.QtWebKitWidgets import QWebView
ImportError: /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5: undefined symbol: _ZN4QRhi10newSamplerEN11QRhiSampler6FilterES1_S1_NS0_11AddressModeES2_, version Qt_5_PRIVATE_API