Mason is a tool that interactively builds a firewall using Linux' ipfwadm or ipchains firewalling. You leave mason running on the firewall machine while you are making all the kinds of connections that you want the firewall to support (and want it to block). Mason gives you a list of firewall rules that exactly allow and block those connections. It can either build a firewall from scratch for you or supplement an existing firewall.
Buildkernel is an intelligent shell script that automates the task of building a Linux kernel. For beginning users, it handles the process from beginning to end, prompting the user when they have to do something. Advanced users can use it to build multiple kernels with little effort. Buildkernel will download kernel and pcmcia source, remove unnecessary code, create symlinks, automatically patch the kernel, build the kernel, modules, and pcmcia modules (nicely), and install them to hard disk or floppy, running LILO as necessary.
Webfs (a.k.a. webfsd) is a simple HTTP server for purely static content. You can use it to serve the content of an FTP server via HTTP, for example. It can also be used to quickly export some files by starting an httpd server in a few seconds, without editing config files first. It knows how to use sendfile() on linux and FreeBSD. There is also sendfile emulation code which uses read()+write() and a userland bounce buffer; this allows one to compile and use webfs on systems without sendfile(). The stripped binary is less then 32Kb, making it great for floppy distros, recycled hardware, embedded systems (cramfs/romfs/flash disk) and other resource-limited environments.