Imitated or simulated

[Over the top]

Imitated or simulated dresses
The dresses of famous designers but with a cheaper price.
Also imitated or simulated computer programs
Thank you

[bhaisahab]

Imitated or simulated dresses
The dresses of famous designers but with a cheaper price.
Also imitated or simulated computer programs
Thank you

We usually use "counterfeit".

[SoothingDave]

The countefeits are imitations, not simulations.

[riquecohen]

Imitated or simulated dresses
The dresses of famous designers but with a cheaper price.
Also imitated or simulated computer programs
Thank you

I assume you mean copies of famous designers' dresses. In AmE they're called knock-offs.

[Tdol]

We use knock-off in BrE too.

Pirate is also used for software.

[jahildebrandt]

Just a semantic note here: For pirating software, I wouldn't put it on the same level as an imitation or knock-off (which can be a synonym for generic.) In most cases it's having the actual software...just without paying for it.

[Tdol]

Microsoft have a piracy page, and in it they do break it down into counterfeit, unlicensed or pirated software, but in general terms, and as these things are on a sliding scale from copies, through cracks to fakes, I see pirate used in BrE as a general term for any dodgy software

[SoothingDave]

You can also pirate movies and music.