https://twitter.com/OS2World/status/983822011389620224
	Hi. I recommend you today to start with OS/2 Warp 4.52 or ArcaOS ( The tools are almost the same of Warp 3). EDM/2 is a good place to start: http://www.edm2.com
https://twitter.com/OS2World/status/983822594465034240
	There is also an RPM with OS/2 Software (https://www.arcanoae.com/resources/downloadables/arca-noae-package-manager/ …), and you can get from it some parts of the OS/2 Toolkit. If you want to develop drivers you require the OS/2 Device Driver Kit. (that is more complex). You can also develop in Qt4 and compile things with gcc.
http://www.edm2.com/index.php/Main_Page
https://www.arcanoae.com/resources/downloadables/arca-noae-package-manager/
http://www.edm2.com/index.php/IBM_OS/2_Toolkit_Documentation
https://www.os2world.com/forum/index.php?topic=953.0
https://www.google.com/search?client=firefox-b-1&ei=QIPPWurPLs7OwAK65K24BA&q=%22OS%2F2+Toolkit%22+site%3Aamazon.com&oq=%22OS%2F2+Toolkit%22+site%3AAmazon.com&gs_l=psy-ab.3...160814.161293.0.161540.2.2.0.0.0.0.128.252.0j2.2.0....0...1c.1.64.psy-ab..0.0.0....0.itT9Og6hC5c
http://www.edm2.com/index.php/List_of_Presentation_Manager_Articles
https://www.ecsoft2.org/
http://www.edm2.com/index.php/Cairo
	http://www.edm2.com/index.php/Doodle
http://www.edm2.com/index.php/Workplace_Shell_Toolkit
http://wpstk.netlabs.org/en/site/index.xml
https://en.wikipedia.org/wiki/Workplace_Shell
https://www.google.com/search?q=OS2+alphablending&ie=utf-8&oe=utf-8&client=firefox-b-1
http://www.edm2.com/index.php/List_of_Multimedia_Articles
alphablending:
	http://www.osnews.com/story/369/Review-eComStation-OS2-1.0/page3/
	http://halfos.ru/documentation/33-os2-api-documentation/67-opengl-os2-developer-reference-guide.html
	http://www.altools.com/ALTools/ALSee/ALSee-Image-Viewer.aspx
	http://www.os2voice.org/vnewsarc/bn2007122.html
	http://www.mozillazine.org/talkback.html?article=194
	https://books.google.com/books?id=9cpU5uYCzq4C&pg=PA202&lpg=PA202&dq=%22OS/2%22+alphablending&source=bl&ots=uatEop2jAL&sig=HAa_ofQSKsk6-8tBR6YZ6MRJG_0&hl=en&sa=X&ved=0ahUKEwiDq5HukLbaAhUk8IMKHR7aCw4Q6AEIWTAI#v=onepage&q=%22OS%2F2%22%20alphablending&f=false