I want open source alternative for unrar and adobe flash.
I use Debian jessie on amd64.
I use unrar for dealing with rar.
I want open source alternative.
I heard there is a software called unarchiver available.
How to use it to extract files using kde ark and xfce xarchiver.
I also use mcomix to read rar comic archives.

Also,I want to know whether flash plugin can be completely replaced by any other open source softwares.I don't want 100 percent compatibility.Atleast
80 percentage compatibility is okay.

Are there any softwares available?

I can't say for sure whether there's a free util to extract rar files. You might try searching for unrar-free:
As for adobe flash, I'm guessing you are referring to the application used to author flash applications. There are some suggestions offered here.

I'd recommend that you dispense with Flash entirely and develop your application using Javascript and HTML5.

Did you try to look up how to use it? And there already IS an unrar command for Linux that's free..it's in openSUSE, Fedora, Ubuntu, and most probably Debian...why, what is the problem with using it? And after being here for SIX YEARS at this point, you should know to do basic research first, before posting things.

If you 'heard about' some software, then that gives you a GREAT thing to search for, doesn't it?
First hit in Google for "open source flash replacement" is:
http://askubuntu.com/questions/57606...ce-alternative

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As mentioned, the replacement for Adobe Flash depends upon whether you're a creator or a consumer -- from the consumer perspective it's Flash or nothing, really, unless you only want it to play Internet Archive games and the like.
I've found the open-source unrar to not work on some archives. When it works it's better than the corporate one but if you need the corporate one you need it.
This is "Linux 101", as the leftpondians would call it, and the information is, at least as I type, available freely...

And when you've installed unrar, just type the command in a terminal and it will tell you how to use it, with more details than in the man page.

For flash, there's gnash.

for unrar I use this .. just find that linux version then move it into flash, firefox sends me to Adobe sight and I down load the tar.gz open source one, not deb etc.. then put it in my plugins folder. or "hack" it with a google pepperflash one, or both just to have them.

I don't wish to be awkward but Adobe don't supply an open source Flash and any version of unrar which works on all files is highly unlikely to be open-source either.

exactly. That is why I just use what works, isn't that is all that really matters ?

RARLAB I do not know if it is open source, I've never needed to compile it to install it, so I never bothered to see, all I know is that it is free and it works.

Adobe I use theirs because it is their stuff, and their stuff works with their stuff. Adobe Flash plugins work with Adobe Flash.

I just told him what I do because, bottom line, It Works.

so now he has something to fall back on.

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And Lightspark.

Regards...

The source code is actually released free of charge on a 40-day trial basis. The code available in most distros is simply compiled from that source, so if you feel guilty about breaking the licence conditions, don't use it! On the other hand, if the creator objected he could always make the trial version compiled, or sue a distro. I suspect the income from Windows and Mac users seems sufficient for him!

Personally, I take the same pragmatic approach as you.
I just thought it worth emphasising that there are no open-source alternatives.