"Inter-Stack" Feature for Questions Deserving of Multiple Stacks.
141623
Asking on Multiple Sites: "Soft-Migration"
10293
How should duplicate questions be handled?
93849
Is there any way I can organize my favorite questions on StackOverflow using self-defined categories?
38367
Towards a Stackexchange-like comment/reputation system for research papers
113886
Allow grouping of favorite questions
157285
Stop the segregation madness. Merge all Stack Exchange sites and differentiate them by tags
156434
Tagging multiple questions at the same time?
137819
When a question is nested within a question: two question marks?
14470
Please add the ability to fold blocks of code in questions and answers
126766
Move questions between Stack Exchange sites
77534
Best practice for marking own questions that could belong on another/multiple sites
84547
Are there 'stack' sites for Mac or Windows?
7406
When merging questions, leave the duplicate one as a placeholder
115725
Strategy for dealing with "which is faster?" questions
111780
How should we deal with questions that fit on more than one Stack Exchange site?
78861
Why are there two separate boxes about duplicate questions?
126132
The Unanswered Section vs. the Unanswered Question Tab: A Critique