Add plugin(s) for FreeArc algorithms

[nemequ]

They're GPL, and AFAICT there is no English documentation, but they're available at http://freearc.org/Research.aspx

[Intensity]

I see value in integrating SREP/REP as well. Note the following: http://freearc.org/research/SREP39.htm#3.92

[luckcolors]

Any news on this? It would be a great feature to have.

[nemequ]

I just took a look at srep and that's probably not likely. It looks like it's really more of a research thing. The main() funciton is huge, it would require significant modifications to work as a library.

Tornado looks more promising; I don't think it would be too difficult to put something together using the splicing API.

I haven't looked at the others yet… which one(s) would be good to have?

[luckcolors]

So here's a list of tools i've used, and also most of these such as srep and precomp are popular in the compression scene.

Precomp: https://github.com/schnaader/precomp-cpp searches the input file for compressed streams and losslessly unpacks them.

Srep: as already mentioned is very good, enables to get from 5 to 20% more after compressed further with lzma.

Nanozip: (http://nanozip.net/, orginal website is dead so you can use http://nanozip.ijat.my/) is a very strong compression tool, it has ratio similar of brotli, and support differen compression modes depending on file type, unfortunately it's not opensource and it has been discontinued(probably?), website died last year.

Example of a compression workflow with these: files > concatenate those with free arc > precomp > srep > lzma2 or nanozip.

I redirect you to those forums where you can find out more about these tools, in case you didn't know them already:
https://encode.ru/forums/2-Data-Compression
http://fileforums.com/forumdisplay.php?f=55