Eclipse is free , flex sdk is free. Is not the eclipse plugin for flex free?
4 Answers
No, it is not free.
There are some free options for development, however:
- Command-line and editor of choice
- FlashDevelop
- Tofino (Visual Studio plugin, if you already have that)

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I guess you mean Flash Builder (formerly Flex Builder).
It is an Eclipse-based IDE, so I guess you can call it an Eclipse plugin, but it is not free.
You can however get a free license for it if you are unemployed or student, or using it for academic purposes.
Check http://www.adobe.com/devnet-archive/flex/free/ out to know more about this offer.
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i thought flex builder and flex eclipse plugin were two different things ? – crowso Mar 20 '11 at 16:32
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@user No, there is Flash Builder and that's it. Flex Builder is the old name. – Dunaril Mar 20 '11 at 17:29
There a two flavors of Flash Builder (formerly Flex Builder). The Flash Builder plugin for eclipse and the Flash Builder stand-alone (build upon eclipse). Both are part of the commercial license.
Beside the commercial Flash Builder plugin there exist many other commercial plugins for eclipse. Nothing confusing about that.

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I am not quite agreeing with you. There is basically no difference between the plugin and the stand-alone: the stand-alone is just the plugin running on a separate Eclipse provided at the installation. – Dunaril Mar 21 '11 at 10:59
There seems to be some confusion here if I'm understanding correctly.
There is a free flex plug-in avilable for eclipse. Flex has been an open-source project and the SDK available as a stand-alone plug-in for the eclipse IDE for free; yes for free, for several years now. For obvious reasons it isn't widely promoted, but it is available. Here is a link explaining the free flex 4 SDK for Eclipse.

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Your link is not related to your answer. If it is available, why won't you post a proper link? – Vanuan Nov 18 '12 at 18:24