Posted this one in the Archive Post but i guess we can have a new Maxscript Plugins/Script thread right?
I'm always searching for these links so i tought it would be nice to  have them in one post (yeah i'm lazy 

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Multi OBJ TOOL   (by Mop)
- Floating window which lists OBJ files in a folder of your    choice.
- Select multiple objects and click "Import"  to get them   all in the scene.
- Double-click on a file in the list to import    it directly.
- Supports GuruWare OBJ plugins and default Max OBJ   plugins.
- Choose to replace objects in the scene if they  already  exist on import.
- Export selected objects to multiple  OBJ files!
- NEW:  Stores settings in an INI file for use  across multiple  Max sessions!
- NEW:  The "Replace" option  applies the existing material,  transform info and  any keyframes  (position, rotation & scale only)  to the imported  objects!
 
Thread: http://boards.polycount.net/showthread.php?t=62330
Download: v1.2
IllusionCatalyst IC.SHAPE    (by SyncViewS)
IC.Shape is a set of instruments designed to increase productivity and    ease the modeling process. The whole toolset is driven by the 3ds Max    standard painting system and tracking functions. It gives its best    paired with a pressure sensitive device, since many instruments react to    natural strokes. The learning path is straightforward, thanks to a    clear interface and shortcuts painless to remember and handle during the    modeling process. Many tools are context sensitive and perform    different actions based on the artist's intent, without complex    combinations of keys. No more than one key is to be hold at the same    time to activate an alternaive behaviour and each modifier key gets    similar results in comparable tools, like draw and erase, or paint    deformation tools. The artist has more time to take care of the creative    process.
Thread: http://boards.polycount.net/showthread.php?t=67965
Download: 2.0 beta 5
TEXTOOLS   (by Renderhjs)
TexTools is a collection of UV and Texture related scripts for 3dsmax 9    and up that can be very easily installed. It was initially started to    improve my personal workflow of UV-editing and Texture previewing in    3dsmax. Eventually I ended up creating scripts that other UV tools can    not do or do not yet provide.
When using TexTools you will see a  Toolbox inside the    GUI of 3dsmax. Most functions only work if you are in the editUVW mode    in 3dsmax (unwrap UVW modifier and then the edit button).
Thread: http://boards.polycount.net/showthread.php?t=69736
Download: v3.00
OUTLINER  (by   Pjannsen)
The Outliner 2.0 is a fast and easy to use scene management tool. It has    a wide range of features, including selecting, hiding, freezing,    linking and grouping objects in the "Hierarchy Mode". In the "Layer    Mode" you can organize your scene by dragging&dropping objects from    one layer to the other. What's more, the Outliner offers support for    nested layers, to manage scenes more efficiently. The interface is    nimble enough to keep it open constantly.
Thread: POLYCOUNT , CGSOCIETY
Download: 2.0
BLUEPRINTCREATOR  (by Xoliul)
This Blueprint creation script automates the task of creating planes  that match bitmap sizes and creating & assigning the right  materials. Just select the bitmaps, set a few options and you're done.  It's mainly meant for setting up vehicle blueprints, but makes the job  of creating even a single image reference plane a lot faster.
Thread: http://www.scriptspot.com/3ds-max/scripts/blueprint-creator
Download: 1.0 
            
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Sticky: [Technical Talk] - Max Plugins