- spire 984 Powerful new number types and numeric abstractions for Scala.
- kind-projector 243 Compiler plugin for making type lambdas (type projections) easier to write
- algebra 206 Experimental project to lay out basic algebra type classes
- jawn 206 Jawn is for parsing jay-sawn (JSON)
- debox 186 Fast, deboxed, specialized data structures for Scala