Softwares Bing has used or consider to use
Code School: the interactive tutor interface is tidy and neat; they now have some Git and Ruby tutors
Wireshark on Ubuntu
Reference: a comparison of two open source and one commercial framework with a report
https://blog.coremedia.com/cm/post/2859817/WebTestAutomation_Selenium_vs_Windmill_vs_QFTest.html
Selenium - firefox automation
Windmill - another framework
Firebug - firefox plugin for debugging
digiKam
gimp-ufraw
This is the best that I have used. It is (1) free, (2) best in preserving formats in Microsoft Word way (for example, preserving table and shade, border, etc.) (3) no watermark
However, it can be slow. It sends results by email and I was thinking the email was not coming, then it came.
http://www.pdftoword.com/
Second place: http://www.pdfonline.com/pdf-to-word-converter/
pdfescape
A lot of tools are drawing tools that can draw UML but not modelling tools. For modeling:
Installation node (October 2021):
on Ubuntu 20.04, install "Modelio 4.1.0 - Debian 64-bit (243.66 MB)"
after installation there was an error, change config as follows:
$ cat /etc/modelio-open-source4.1/modelio.config
MODELIO_PATH=/usr/lib/modelio-open-source4.1
SWT_GTK3=1
SWT_WEBKIT2=1
UBUNTU_MENUPROXY=0
LIBOVERLAY_SCROLLBAR=0