My workflow - in no particular order:

Hexagon - for kitbashing, if the software was stable & supported, I would use it more - I grok the UI.  I'll be replacing it with the modeler in Zbrush, since that product is actually supported.

3DSMax - File >export for those rare .3ds models I need to get into Poser.

Daz Studio - File>export to get genesis figures out of DS and into Poser.

ZBrush - learning how to modify stuff I have - also learning the modeler in the latest version.

RSRConv - To convert all of those pesky .rsr files that still reside in some of my older files.

Texture Transformer - to convert V4 skins to other figures

Texture Converter 1 & 2 - to convert M4/V4 skins to other figures.

Wardrobe Wizard and Xdresser - For some clothing conversions (I run all of my clothing products through Wardrobe Wizard, Xdresser & the Fitting Room - I keep whichever version comes out best for what I do. I use the stand-alone version of WW because it can run in the background)

Photoshop Elements - for fixing textures for kitbashing.  And why on earth does anyone buy the full version of Photoshop?  Is CYMK & preflight that important for hobbyists?

WINE - to run a number of windows only Poser helper programs (Like Texture Converter, Xdresser and Dimension3D's scripts).

Parallels - OS virtualization software to run my copy of 3dsMax.

DittoGUI - for installing content (It's a Mac issue - thanks for nothing, Steve.)

Objaction Mover & RTEJava - to deal with encoded files

Expression Magic for P6 Jessi, Sydney, Aiko 3, V2, V3, V4, M4, Genesis 1, Genesis 2F&M - why spend money on expression products when you have these?

Tool Collection by Dimension3D - lots of simple, 1-shot tools that makes life easier.

Vue - for outdoor scenes.

Reality - It understands LuxRender better than I do.

Prepper - Converts .objs to .cr2s

Cr2 Editor - Does what it says on the tin. 

Comic Life 2 - for working up my stories.

Python Scripts for Poser - yes, these are all must have.

Scripts by Snarly-Gribbly - All of them - doesn't that make it easy? (EZ-skin 2, Scene Fixer, EZ-Metals & the infamous Snow Machine - if you need some snow.  I do from time to time.) Scripts by Netherworks - Hair Control System 2014 [You will need HCS II & a copy of Poser 7 if you want to use HCS for the SM figures - please join me in pestering him to update these for HCS 2014 - I would really like to retire Poser 7 & recover that HD space.]  Creator's ToyBox - for fixing all of your figures.  Batch Material Converter - converts material .pz2 to .mc6 and puts them in the proper location like God & Poser want materials to be.  Can also switch .mc6s back to .pz2 if you wish to deal with materials in DS, since most of their add-ons seem to live in the Poser 4 era.  MAT Writer Panel 2014 - for creating material files.  Scene Toy - Nifty tools to deal with scenes.  Power Locks - indispensable when creating or modifying poses.  Spawn 2014 - Morph and Parameter Dial creation.

Scripts by SemiDieu - Buy all of them - it will make your life easier.  Advanced Figure Randomizer (Comes with Advanced INJ Builder, which amazingly will make INJ/REM for your dial spins - you're welcome.  So stop asking for a tutorial to make an INJ/REM for you dial-spun creations.  Texture Variation - makes texture variations for figures - useful if you need more than the bog standard Caucasians that the vendors inflict on us.  Advanced Shaders - for making displacement "second skins", tatoos, and such.  Library Manager - if you don't like the standard Poser Library, feel free to move to this.

Scripts by Dimension3D - Group Morph Dials by - groups the dials on the DAZ Gen3 figures.  Render - brings all firefly render options to 1 location, easy to read.

K4 Mixer by Colorcurvature - allows you to mix child & adult figure based on the same mesh, allowing you to build teenagers.  Originally designed for K4/M4, it also works with V4/K4.  After some experimentation I discovered that it will do the same for the DAZ Gen3 figures & the DAZ Gen2 figures.

Crowd Generator by Fugazi 1968 - Python script to generate random crowds - I don't do single image renders.

TDMT by Cage - Transfers morphs between two Poser actors with incompatible vertex structures.  Use it if you dare!!!!

Shoe Converter by PhilC - the only tool available to get V4's shoes on all my other girls.

Matmatic by BB - should be part of the base Poser install. - Quit you whining and learn how to use it - your renders with thank you.