cxxtools is a library of unrelated but useful C++ classes. It contains an argument parser, a base-64 encoder/decoder, a C++ interface to iconv, md5-stream for easy MD5 calculation, threading classes, socket classes, a dynamic exception-safe buffer, a wrapper for dlopen/dlsym, a pool template (e.g. for a connection pool in a multi-threaded application), query_params, and a class for easy parsing of CGI parameters (GET and POST) in a CGI program.
Tntdb is a c++-class-library for database access. It implements a database-independent layer, which loads the actual driver dynamically when a connection is made. The classes use automatic resource management with reference counts. Resources are freed when the classes go out of scope. Error handling is done with exceptions (derived from std::exception). There are STL-like iterators for result sets and rows, and also the cursor is an STL-like iterator. It is written in standard C++ with Linux. Drivers for PostgreSQL, sqlite3, MySQL, and Oracle are available.
Tntnet is a Web application server for generating Web applications in C++. HTML pages with some additional tags for inclusion of C++ code are compiled into shared libraries and served from tntnet. It resembles PHP, JSP, or Mason, but the programming language used is C++, and the pages are compiled into native code before serving. Tntnet is fully multithreaded and supports HTTP keep-alive for best performance. Its dynamic pages are faster than static pages with other Web servers, while creating Web applications is simple.