org.scala-lang.macro-paradise
type macros beta 3

No spec yet, just docs at http://docs.scala-lang.org/overviews/macros/typemacros.html.
List of known issues: https://issues.scala-lang.org/secure/IssueNavigator.jspa?mode=hide&requestId=11912.
SI-6859 type macros no longer crash sbt

By mimicking alias types, macro types no longer trip a sanity check
in sbt 0.12 and 0.13: https://github.com/harrah/xsbt/blob/ef39aeb9c1ea443c17356695758a31152910c4a7/compile/interface/src/main/scala/xsbt/API.scala#L221.

This workaround makes me sad but it's the only option to make type macros
immediately useful. Principled fix pending.
untyped macros beta 2

No spec yet, just docs at http://docs.scala-lang.org/overviews/macros/untypedmacros.html.
List of known issues: https://issues.scala-lang.org/secure/IssueNavigator.jspa?mode=hide&requestId=11912.
JIT macro compiler

Allows using macro implementations in the same compilation unit that
defines them if you enable -Xmacro-jit. Very-very experimental.
macro annotations, pre-alpha v2

unfortunately the original idea of hijacking enterSym didn't work
(see the comments in Namers.enterSym for more information), so I had
to resort to a very ugly hack, since I do need macro annots right away
SI-7470 implements fundep materialization

This fix provides implicit macros with an ability to affect type inference
in a more or less sane manner. That's crucial for materialization of
multi-parametric type class instances (e.g. Iso's from shapeless).

Details of the technique can be found in comments. Also see the discussion
at https://github.com/scala/scala/pull/2499.
quasiquotes beta 1

No spec yet, just docs at http://docs.scala-lang.org/overviews/macros/quasiquotes.html.
List of known issues: https://issues.scala-lang.org/secure/IssueNavigator.jspa?mode=hide&requestId=11912.