Hi, stone_keat.
Welcome to ZOIDS!
Okay, now for the history lesson. *ahem*
TAKARATOMY is the main license holder and Zoids toy manufacturer from Japan (a merger of TAKARA and TOMY, which happened around 2005).
Their current Zoids line is branded as "Zoids Original" - a return to the spring- or battery-operated 1/72-scale Zoids toys that TOMY was producing since 1983.
http://takaratomymall.jp/special/zoids/lineup.html
Tomytec is another manufacturer specialising in 1/144-scale Zoids model kits, which are branded as "MSS" or "Modelers Spirit Series".
These model kits are almost like smaller versions of the HMM Zoids.
http://www.tomytec.co.jp/mss/zoids/index.html
Kotobukiya is a model kit manufacturer that produces two ZOIDS line - HMM (Highend Master Models) and D-style.
HMM is marketed as being 1/72-scale, very detailed model kits while D-style are the "cute", "no-scale" versions.
As far as I understand, Kotobukiya pays for the license to use the ZOIDS name and design inspiration from TakaraTomy.
http://main.kotobukiya.co.jp/pk_zoids_t/
These are the 3 official Zoids manufacturers currently: TAKARATOMY, KOTOBUKIYA, TOMYTEC.

So, in summary for the official products:
> Small, 1/144-scale, poseable Zoids kits are in Tomytec's MSS series.
> Small, no-scale, poseable Zoids kits are in Kotobukiya's D-style series.
> 1/72-scale, poseable Zoids kits are in Kotobukiya's HMM series.
> 1/72-scale, non-poseable, motorised Zoids toys are in TakaraTomy's "Zoids Original" series.
Note that I use "model kit" for Tomytec's MSS and Kotobukiya's HMMs and D-styles since these are non-motorised.
So far, only ZOIDS ORIGINAL has the mechanical toy gimmicks.
For current "unofficial" Zoids product, as
limfreelance mentioned, these are not licensed from TakaraTomy and I think is only limited to copies/redesigns of HMM and D-style Zoids.
For those HMM and D-style model kits where you see "TakaraTomy" on the box, those should still be manufactured by Kotobukiya's factories. It's just a promotional branding for ZOIDS between the companies.
To me, it does not matter whether you get a Zoids model kit or Zoids toy.
You buy or build one - please share your pictures and stories here!

Now - can any Japanese readers/speakers tell me what this is?
http://z-kizuna.com/This post has been edited by riderTEKRAN: Oct 4 2013, 10:06 PM