Kawa implements the following semi-standard SRFIs (Scheme Request for Implementation):
SRFI 1: List Library, if
SRFI 2: AND-LET*: an AND with local bindings, a guarded LET* special form.
SRFI 13: String Library. Needs some polishing.
SRFI 30: Nested Multi-line Comments.
SRFI 62: S-expression comments.
SRFI 64: A Scheme API for test suites.
SRFI 95: Sorting and Merging.
SRFI 97: Names for SRFI Libraries.
SRFI 108: Named quasi-literal constructors.