The SFL (Standard Function Library) from iMatix is a portable function library for C/C++ programs. The SFL is the result of many years’ development, and is provided as Open Source software for the benefit of the Internet community.
The SFL provides about 450 functions that cover these areas:
Compression, encryption, and encoding;
Datatype conversion and formatting;
Dates, times, and calendars;
Directory and environment access;
User and process groups;
Inverted bitmap indices;
Error message files;
String manipulation and searching;
Internet socket access;
Internet programming (MIME, CGI);
SMTP (e-mail) access;
Server (batch) programming;
It is free software.