KNoFault is a tool that protects your files with XOR encryption. It can use a username and a password to encrypt, or it can any file as a key. When given an incorrect decryption key, instead of showing an error it will encrypt the already encrypted file with the new info. This makes it possible to encrypt a file several times so that only two people together can use it, for example.
lisodsp is a multi-open device driver for Linux. It is a kernel module that installs a OSS DSP device which can be opened many times in write mode. Reading the device produces a mix of all opened channels. lisodspd is a full-featured user space daemon which forwards audio data to a real OSS device. In addition lisodspd allows the user to set up a filter between a lisodsp device and the real OSS device. The device supports all linear formats (8/16 bit, little/big endian, mono/stereo) in a wide sampling range (4800 to 48000Hz).