In this post I'll just show some apps that can help you and some recommendations, let's get started (you can use whatever you want, of course):
Instead of Openoffice, I feel libreoffice is way more "light" than openoffice, so yeah. You can also use playonlinux and install your favorite microsoft office, they works quite fine using playonlinux.
Stable, Dev and Beta are available through AUR, so you can install via aurman. Firefox is also available for people that doesn't feel comfortable using chrome
If you don't like evolution or kmail, thunderbird is available.
Personal choice, I'm not a huge fan of empathy...
If you don't have any issues about security, skype is available too.
Forget about installing a shitload of binaries, and libraries, and drivers and whatever else. Just install this guy to see videos and stuff.
If you need something fast to see images from cellphones or whatever else, use digikam (for QT) or shotwell (for GTK), both of them do a nice job. If you need something more, just install gimp.
It's a matter of preference. I like clementine for a music player, but I gave here three choices.
I don't know about you, but having a terminal in the "quake" way is quite sexy. Available for QT desktops (yakuake) and GTK desktops (guake).
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