utfout is a command-line tool that can produce UTF-8 (Unicode) strings in various ways and direct them to standard output, standard error, or direct to the terminal without the need for shell support. Strings can be repeated, delayed, randomly-generated, written to arbitrary file descriptors, interspersed with other characters, and generated using ranges. printf(1)-style escape sequences are supported along with extended escape sequences. utfout(1) sits somewhere between echo(1) and printf(1).
YAGAC is a library that when linked to your C program, allows you to conveniently track or trash memory leaks within your application while it is still running. You can have multiple garbage collectors according the code part you are in. It tracks memory assigned by your code only, and does not monitor third part libraries. Tracking can be activated by updating a debug flag without restarting your application. It is intended for use with daemon-type programs.