Yes, Tang predates the space program. Tang came out in 1957, but it wasn't popular until they picked up on marketing it as the drink John Glenn took into space. Teflon and Velcro are even decades older. The Fisher space pen wasn't developed with NASA money, but the developer clearly did it with the goal that it be useful in space. NASA which had been using mechanical pencils did buy the already developed product. NASA laid out about $2400 total to buy a few hundred pens.