Mokka is a great graphical user interface to see your markers in 3D. For processing your data, you can use BTK (Biomechanical Toolkit), in conjunction with Octave (a free Matlab-like environment). Personally I use BTK and Matlab, but if I could not have access to Matlab, Octave would be the natural way to go.

Opensim may be something you want to look at

http://opensim.stanford.edu/

You can look at http://www.quintic.com/

they have a free version for 21 days!!! depending on your needs it can help

Thank you very much for your answers. I will actually be going through all these suggestions.

I have actually seen a proprietary japanese piece of software that does exactly what I need. After videos are imported, calibrated and synchronized, you place markers and/or lines on everything you need to measure and manually digitize frame by frame. Everything is ready-made, so there is no need for programming.

Is there anything like this available for free/open source?

If I choose Octave/Matlab and BTK, will there be programming involved? I am looking to avoid that if possible.

Nikolaos : Indeed, BTK and Octave/Matlab involve programming. Moreover, I didn't realize you use standard video cameras and not a motion capture system. I don't think BTK has a straightforward way to work with video images. I'm curious to know about the proprietary japanese software you talk about.

Kinovea is also free. It's very similar to Dartfish or Silicon Coach programs. I believe the website is kinovea.com

I was going to suggest a really cool (and FREE) program called Blender (home page at http://www.blender.org), however after scanning their latest motion tracking documentation (http://wiki.blender.org/index.php/Doc:2.6/Manual/Motion_Tracking) it may not have exactly what you need. Still, I've found Blender quite useful for developing animations. Go have a look-see.

I also tried Blender, but it did not seem really useful for what I want to do, as it is a more animation production oriented program. Thanks for the suggestion anyway!

@Félix Chénier, The Japanese piece of software is called Frame-DIAS. Here is the website:

http://www.dkh.co.jp/en/product/framedias5_top.html

*It seems that only the version I was using was Japanese (I am currently in a Japanese Institute).

So, I am looking for something similar. I don't really care for auto-tracking right now though.

From what I see, Kinovea works only with 2D stuff?

So, I ended up using SkillSpector, and it works fine for me. Great, free option. I couldn't get it running until I installed this -quite old- Canopus DV Codec:

http://www.free-codecs.com/download/Canopus_DV_Codec.htm

Hope this helps someone.

Hi Nikolaos,

I encourage you to take a look to the OpenSim freely available software and its Matlab tools:

http://simtk-confluence.stanford.edu:8080/display/OpenSim/Scripting+with+Matlab

https://simtk.org/home/matlab_tools/

Kinovea

Argus: http://argus.web.unc.edu

What is Tracker

https://physlets.org/tracker/

Kinovea

I suggest using the "nuitrack software" or "MVTA= Multi media task analysis software"

they are good and easy use software.

hamideh bidel