Here are some links to tools and resources that I have found to be useful.

Images (particularly for presentations, blogs, etc)

Compfight	a Flickr search engine (just filter results for Creative Commons licenses)
freestock.ca	free stock photos
Getty Images	Getty Images! Free to embed on your blog!
Google Image Search	include site:wikimedia.org for open-content results
openclipart	clip art
pexels	free high quality stock photos
Pixabay	photos, vectors, illustrations
sxc.hu	free stock photos and illustrations
Unsplash	high quality royalty-free images
Wellcome Images	a collection of science and history images by the Wellcome Trust
Fotosearch	photos, clip art, vectors, etc.

Stimuli (particularly for experiments)

Bank of Standardized Stimuli (BOSS)	photos of various objects
cogsci.nl	pictures and videos with standardised ratings
Face Research Lab London	adult faces (incl. attractiveness ratings)
FACES (MPIB)	database of facial expressions
Nencki Affective Picture System	stimuli to induce emotional states

Online studies
I highly recommend SoSci Survey. With some basic PHP programming (with the help of the online manual and forums), you can design pretty much any kind of online experiment or survey. And for non-commercial purposes, it’s free of charge!
When recruiting German-speaking participants, their panel of at least 60,000 *active* participants (as of Jan 2015) can be a valuable resource. Scroll to the bottom of that page for a list of further panels that I have yet to personally try.
And if your study is already up and running, here are a few possible places to post the link:

• The ‘Mitmachen!‘ page of Psychologie Heute
• The ‘Psychostudien‘ “spin-off” of the ‘SoSci Survey“>Psychologennetzwerk‘ Facebook group (now also known as the ‘Psystudents‘ non-profit society, run by psychology students and therapists-in-training)
• The ‘SampleSize‘ subforum of Reddit

Science/psychology podcasts

• The Black Goat: A podcast by personality psychologists Sanjay Srivastava and Simine Vazire, and social psychologist Alexa Tullett. It’s like having three really thoughtful mentors (who unfortunately can’t write your letters of recommendation) discussing the realities of academia, new developments in the field, and how things should be, all while you wash the dishes.
• Everything Hertz: A podcast by Dan Quintana and James Heathers (both more or less biological psychologists with methodological leanings). They cover all sorts of topics in the behavioural/biological/health sciences and complement each other perfectly in opinions and temperament. Their friendship is so palpable that you’ll start feeling less lonely yourself.
• Circle of Willis: A podcast by neuroscientist Jim Coan, each episode consisting of a conversation with a scientist. He’s like the Marc Maron of science podcasts. (Mainly because his speech pattern reminds me of Maron, particularly during his monologues.)
• Very Bad Wizards: A podcast by philosopher Tamler Sommers and social psychologist David Pizarro. This is probably the most popular podcast of the bunch, but somehow the one I’ve listened to the least (despite the bigger back catalogue).
• Rationally Speaking: A podcast by the New York City Skeptics, hosted by writer/statistician Julia Galef (with older episodes featuring biologist/philosopher Massimo Pigliucci as co-host). The show covers broader topics, but often enough features guests relevant to psychological science and methodological issues.
• The Bayes Factor: A podcast by cognitive psycholinguist JP De Ruiter and Bayesian enthusiast and educator Alexander Etz. I’m sure Alex has other research interests, but that’s what I associate him with. And probably not without good reason — when looking for basic literature or explanations, his papers and blog are probably where I’ll head to first. The combination of expertise definitely provides the podcast with plenty of potential. (It has one of the smaller back catalogues at the moment.) Thus far, episodes have featured interviews with a good mix of other researchers, covering lots of topics relevant to a career in science. I look forward to more Bayes.
• Two Psychologists Four Beers: A podcast by social psychologists Yoel Inbar and Michael Inzlicht. There’s only (as I’m adding this link) one episode so far, but based on the hosts, it certainly holds lots of promise — I am fairly familiar with the rest of Michael Inzlicht’s work (particularly his academic work on self-control and his social media presence), and I like a lot of what he does, while Yoel Inbar is a frequent guest on Very Bad Wizards (see above), so that should account for some amount of podcasting experience right from the get-go.