None of the packages you mentioned are cheap, in the sense that few individuals can afford them. Most companies pay commercial fees and get a supported product. Universities have special arrangements to enable use by students during regular semester courses. Such academic licenses prohibit use for any other purpose.
This is as it should be, since these are very sophisticated programs that cost a bundle (hundreds of man-years) to develop and support.
First, there was a "nearly" free version of Aspen, a fairly complete process simulator, in the public domain, available through the Department of Energy. I used this in the early days, before Aspen Plus went private in 1981 or so. I don't even know if it's still available or what the terms and conditions are. Using this is a real challenge, as the learning curve is very steep. Also, it is basically unsupported.
Second, the old ChemShare program is available as a Windows application called Winsim.
Finally, if cost is an issue, my favorite is Dick Russell's PD Plus. This is the best priced, most robust, and certainly the fastest product out there in my opinion. Even individual engineers should be able to afford it quite easily. For more information, see: http://www.deerhaventech.com
PD Plus has beaten several of the major simulators by factors of over a hundred in many large-scale, side-by-side tests I have conducted personally. It has a flat file, keyword-driven interface that I learnt to use in a week, being a creature of the old keyword-driven programs of the 1970s and 1980s. It doesn't do electrolytes and such exotic things, but for normal refining, petrochemical, and complex chemicals systems, it's just great. Best of all, you get timely, personal support from the maestro Russell himself.