Possible enhancements and directions of development, in no particular
order:

- EventLog library appender.

- org.apache.log4j.net.ZeroConfSocketHubAppender.

- Reading log4j-like XML configuration files.

- More flexible events format for transport over network. ASN.1? XML?
  YAML? JSON?.

- Modular PatternLayout; public PatternConverter classes; user defined
  format specifiers.

- More flexible log file rotation, like keeping only last 31 days of
  logs produced by DailyRollingFileAppender, rotate at midnight, etc.

- Installers for Debian, Ubuntu, Windows/Qt Creator.

- Allow specifying codecvt facet for FileAppender through properties.

- Custom codecvt facet for use FileAppender using log4cplus' internal
  wchar_t <-> chart conversion routines.

- Research possible use of Valgrind at compile time.

- Research possible use of -fmudflap.

- Improve CMake configuration checks (TLS) to be on par with
  Autoconf's.

- ConsoleAppender or specialized appender with colored output per log
  level.