Accept question of type "What is the best..." on any other sibling site, not necessarily Stack Overflow
924
Give each site a parallel site for polling, recommendations and subjective-ish stuff
35480
Flag a question as being off-topic and belonging on another SE site (which is not in the suggested list)
130134
Which programming forum is best for Opinion based questions?
138305
Automatically suggest asking on another site
137525
How do sites moderate self-answered questions?
98520
Where to post questions asking for expert opinion?
3281
Flag/close/share questions/answers?
46498
What algorithm does Stack Exchange use to determine if a question may be subjective?
30441
Please add a way to reach the question's site from the question
116860
Is it poor form to switch accepted answers?
24062
Best answer versus best solution
52183
Prevent specific sites from being overrepresented in the hot questions list
40390
Where to or how to ask "Best of" Questions for what software tools to use
113886
Allow grouping of favorite questions
111780
How should we deal with questions that fit on more than one Stack Exchange site?
23493
Is there a Stack Exchange section FOR vague and rambling questions?
23667
Build and strengthen the Stack Exchange community with "crossover questions" between sites