Raspberry Pi:

• HiPi Perl Modules for the Raspberry Pi I/O
• read raw mouse data in Linux

Hashes:

• How Hashes Really Work
• Hash Crash Course

computer sciencey stuff:

• Create bindings to compiled code without XS with FFI::Platypus
• Big O notation
• ARRAYS OF ARRAYS
• HASHES OF ARRAYS
• perlreftut
• perlipc
• Perl and Net::Pcap
• Schwartzian_transform wp://Schwartzian_transform

Regex:

• All the sequences and escapes
• Convert a binary string to hexadecimal using substitution

Lists:

• List::Compare ~ this has functions to check for subsets.
• Set::Array
• List::Util
• List::MoreUtils
• Set::Bag

Perl Modules:

• File::Glob
• File::Find
• File::Copy
• App::FatPacker
• Win32::MediaPlayer
• Module::Starter
• Email::Stuffer mod://Email::Stuffer
• Email::Stuffer cpan:
• Email::Stuffer dist:

Other:

• file test ops
• The "blog" of "unnecessary" quotes
• real ultimate Perl power
• Re^3: selecting columns from a tab-separated-values file
• Re^2: Removing elemets from an array
• Re: copying a file with .bak extension -> How can I use Perl's -i option from within a program?
• How to install module with CPANPLUS without prompting? id://792280
• How do I link to modules on CPAN?
• What shortcuts can I use for linking to other information?
• quotemeta doc://quotemeta
• Quote Like Operators
• log
• Perl's file test functions
• Foreach Loops
• useful looking OLE links
• Clojure is a Lisp language used for some interesting things like Overtone, to do sound synthesis using SuperCollider. I haven't done much with it lately but maybe I'll get to it again in 2019.
• Pure Data is a graphical programming language for sound synthesis which has been extended to do things like physics modeling and multimedia installations.
• OpenSCAD does parametric 3D modeling in a C like language except the variables aren't really variable.
• GLSL is the OpenGL Shading Language. It lets you do interesting real time transformations on images.
• I mostly use Python when I want to modify an existing Python plugin in Inkscape.