Prima is an extensible Perl toolkit for multi-platform GUI development. Platforms supported include Linux, Windows NT/9x/2K, OS/2 and UNIX/X11 workstations ( FreeBSD, IRIX, SunOS, Solaris and others). The toolkit contains a rich set of standard widgets and has emphasis on 2D image processing tasks. A Perl program using PRIMA looks and behaves identically on X, Win32 and OS/2 PM. The toolkit includes a visual builder ( VB ) and a graphic pod viewer utility ( podview ). The examples are installed into perl site in Prima/examples directory. A 'hello world' code is as simple as follows: use Prima qw(Application Buttons); Prima::Window-> create( text => 'Hello world!', size => [ 200, 200], )-> insert( Button => centered => 1, text => 'Hello world!', onClick => sub { $::application-> close }, ); run Prima; WWW: https://metacpan.org/release/Prima