Sysquake 4 LE is the free version of Sysquake. Sysquake LE is available for Windows XP and Vista, Mac OS 10.4-10.5, and Linux x86 with GTK+ 2 and X11.
Please contact us to order Sysquake, which offers support for low-level file access, extensions (those provided by Calerga as well as those you will develop yourself in C), Sysquake Application Builder, an integrated development environment, a 840-pages PDF user manual, and more.