Miscellaneous Utilities - mostly scientific or programming utilities

Comment/Uncomment - marks text in Pascal or C source code as comments.
Special Key - by Andrew Welch inserts four characters symbolizing the command key, checkmark, diamond and apple character. These can be viewed in a document if they are in the Chicago font.
Clipboard Dump - turns the clipboard contents into a hex dump.
Constant Values - any math or physics constant like π or e that is highlighted or in the clipboard is replaced with its value.

Constant	Description	Value
	pi,π	numerical constant	3.1415926
	e	numerical constant	2.71828182846
	c	speed of light in vacuum	2.99792458 * 10^8 m/s
	g	acceleration due to gravity	9.80665 m/s^2
	G	Newton's gravitational constant	
		6.672 * 10^-11 N*m^2/kg^2
	k	Boltzman's constant	1.380622 * 10^-23 J/K
	h	Planck's constant 	6.626176 * 10^-34 J*s
	R	Ideal Gas Constant	8.31441 J/K*mol
	N 	Avogadro's number	
		6.022045 * 10^23 molecules/mol
	e-	charge of an electron	1.602189 * 10^-19 C
	me	mass of an electron	9.110e-31 kg
	mn	mass of a neutron		1.675e-27 kg
	mp	mass of a proton		1.673e-27 kg
	atm	1 atmosphere of pressure	1.01325e5 Pa
	eV	1 electron Volt of energy	1.602e-19 J
	amu	1 atomic mass unit	1.661e-27 kg
	mc2	energy equivalent of 1 amu	0.511 MeV
	V	volume of ideal gas  	22.4 liter/mol
	F	Faraday's Constant	96487
	kpm		9.80665 J
	kWh		3.6 * 10^6 J
	kcal		4.1868 * 10^3 J
	PS		735.49875 W
	W		1.360 * 10^-3 PS
	at 		980,665 mbar
	Torr		1.333 mbar
	yard		0.91444 m
	foot		0.3048 m
	in		2.54 cm
	gal		4.546 Liter
	sm 		1852 m
	kn		0.5144 m/s
	oz		28.35 g
	lb		453.6 g
	pt		568.25 ml

Application Info - puts into the clipboard the path to the frontmost application and the time elapsed since it was launched. This value is not pasted automatically.
Screen Saver - is based on a very old code to compute an Icosahedron. I made it grayscale and changed it to compute the shades and views in realtime, instead of a much faster offscreen copy.
Speak Text - uses the new speech manager to speak text in the clipboard.