A popular topic for people migrating from Windows to Linux is alternative or equivalent apps. App lock-in is not much different from vendor lock-in. When specific apps run only on specific computers then the lock-in becomes more frustrating. Breaking personal dependencies from a specific app is a challenge.
While using almost any app creates some form of lock-in, I have several apps that are locked to my office desktop. The simple reason is I have the Trinity Desktop (TDE) installed there. The culprits:
I expect to convert KMail last. I have been tinkering with migrating KAlarm to Orage and some kind of central calendar server.
I thought, more like hoped, I could migrate from the other apps without too much weeping and gnashing of teeth.
I do not use K3B much anymore. I still do but only for data disks, usually for testing ISO images. I have not tinkered with creating an audio CD in a very long time.
I do not use Digikam much other than as a basic photo library manager and importing files from my camera. I could count how many times I performed any kind of touch-up. Several apps likely could replace Digikam with little noise.
Amarok 1.4 is a classic in the free/libre software world. Replacing that app might be a challenge.
My first target is migrating from Kaffiene. I use Kaffeine as a basic TV capture card testing app and on my office desktop, to play TV occasionally in the background while working or tinkering on the computer.
On goes the journey.