@user777 suggested the introduction of a tag for parameterized algorithms in a question:
We should have tag about "Parameterized Algorithm" that covers the technique of this subject like: bounded search, kernelization, iterative compression, etc. I found only "Parameterized Complexity" which is another topic in this topic.
Although this is a rather niche topic on CS.SE, I agree that the current tag doesn't cover all questions related to parameterized algorithms.
Please cast your votes on one of the answers below, or create a new answer if your opinion isn't represented in any of the existing answers.
Any further comments or suggestions are welcome.