How to create fillable PDF forms without Adobe Acrobat / Ausfüllbare PDF Formulare ohne Adobe Acrobat erstellen

I was looking for a way to create fillable PDF forms for free / with open source Software without the need to buy Adobe Acrobat Software.

How-I-fixed-it:

I found the right hints here:
http://www.urz.uni-heidelberg.de/ausbildung/dokumentation/pdfformulare.html
and  here
https://danilop.wordpress.com/2008/07/02/how-to-create-pdf-forms-with-openoffice/

It can be done by either using OpenOffice or by using Latex.

Here are some sample LaTeX documents:
http://tex.stackexchange.com/questions/29842/save-fillable-forms
http://texwelt.de/wissen/fragen/7768/wie-erstelle-ich-ein-gutes-ausfullbares-pdf-Formular

LaTeX documents can be edited and compiled to PDF with many different free Tools, e.g. TeXStudio: http://texstudio.sourceforge.net/

TexStudio does not find MIKTex LaTeX installation, AutoConfig does not work

I installed MIKTeX 2.9.5105 64 Bit on my Windows 8.1 64 Bit OS. Then I installed TeXStudio 2.7.0 as my favourite TeX Editor.
Starting up TeXStudio, it did not find my MIKTeX Installation and therefore refused to compile documents.

How-I-fixed-it:

I found some hints here:
http://tex.stackexchange.com/questions/71073/i-installed-texstudio-and-miktex-in-the-wrong-order-how-can-i-do-a-clean-instal

Close TeXStudio. In Windows Explorer navigate to: %APPDATA%\texstudio\ (Alternatively you can navigate to C:\Users\YOUR_WINDOWS_ACCOUNT_NAME\AppData\Roaming\texstudio).

Delete texstudio.ini file.

Restart TeXStudio.

This fixed it for me.

How to use LateX bibunits package with TeXnicCenter

I got a LateX document template that was using the bibunits package to create the references list. Out of the box, TeXnicCenter was not creating the references list in the document, there were still "unknown references".
How i fixed it:
I found the right hints here: http://latex-community.org/forum/viewtopic.php?f=50&t=9168&p=74542
There are two steps to make it working:
1. In your project folder create a batch-file with the following Content (in case it's not already part of the template files):

@echo off
echo Processing auxiliary files with BibTeX
For %%i in (*.aux) Do bibtex %%i

save it e.g as 'compilebib.bat'.
2. Then click 'define output profiles' (Alt+F7), select the postprocessor tab, and add new. Put 'compilebib.bat' under executable.