Seeking prop firms that have demo platforms
All the funding companies (sometimes known here as “prop firms”) have demo platforms in the sense that their evaluations are all on “demo accounts”/“simulated accounts”.
If you’re asking which ones allow a free trial of their evaluations, then for futures the best one would probably be TradeDay (they allow one free trial, but you can actually repeat it by using a different email address, shhhh, I did not tell you this!), and for CFDs/spot, the best one would probably be FTMO (you can take their free trial as many times as you like, but only one attempt at a time).
One to keep well away from is probably “Audacity Capital” whose reputation is questionable at best, and they depend heavily on spamming trading forums to find new customers. Today alone, for example, two “new members” have joined Babypips specifically to make posts “recommending” Audacity, joining and posting quickly, without even apparently looking at the rest of the forum at all!).
Audacity’s recent Trustpilot reviews include such niceties as “fraud prop firm”, “worst prop firm in the industry” and other similar observations from their verified customers! 
Topstep allows you to create a practice combine. Its also true futures market price so even better!
Hope this helps! 
Only by paying for a non-practice one. It’s something extra for paying customers, not a free trial.
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Yes, sorry I did not realize you have to be paying for a combine first!
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So prop firms and trading education companies with stimulated accounts are different