SRFI 1: List Library
SRFI 2: AND-LET*: an AND with local bindings...
SRFI 4: Homogeneous numeric vector datatypes
SRFI 5: A compatible let form with signatures and rest arguments
SRFI 6: Basic String Ports
SRFI 7: Feature-based program configuration language
SRFI 8: RECEIVE: Binding to multiple values
SRFI 9: Defining Record Types
SRFI 11: Syntax for receiving multiple values
SRFI 13: String Libraries
SRFI 14: Character-set Library
SRFI 16: Syntax for procedures of variable arity
SRFI 17: Generalized set!
SRFI 19: Time Data Types and Procedures
SRFI 23: Error reporting mechanism
SRFI 25: Multi-dimensional Array Primitives
SRFI 26: Notation for Specializing Parameters without Currying
SRFI 27: Sources of Random Bits
SRFI 28: Basic Format Strings
SRFI 29: Localization
SRFI 30: Nested Multi-line Comments
SRFI 31: A special form rec for recursive evaluation
SRFI 34: Exception Handling for Programs
SRFI 35: Conditions
SRFI 38: External Representation for Data With Shared Structure
SRFI 39: Parameter objects
SRFI 40: A Library of Streams
SRFI 41: Streams
SRFI 42: Eager Comprehensions
SRFI 43: Vector Library
SRFI 45: Primitives for Expressing Iterative Lazy Algorithms
SRFI 48: Intermediate Format Strings
SRFI 54: Formatting
SRFI 57: Records
SRFI 59: Vicinity
SRFI 60: Integers as Bits
SRFI 61: A more general cond clause
SRFI 62: S-expression comments
SRFI 63: Homogeneous and Heterogeneous Arrays
SRFI 64: A Scheme API for test suites
SRFI 66: Octet Vectors
SRFI 67: Compare Procedures
SRFI 69: Basic hash tables
SRFI 71: Extended LET-syntax for multiple values
SRFI 74: Octet-Addressed Binary Blocks
SRFI 78: Lightweight testing
SRFI 86: MU & NU simulating VALUES & CALL-WITH-VALUES...
SRFI 87: => in case clauses
SRFI 98: An interface to access environment variables

SRFI 14: Character-set Library

Original specification: SRFI 14