General:
My favourite blogs are the following: VoxEU, The Economist's Free Exchange, The Economist's Daily Chart, Project Syndicate and Never Mind the Markets (in German).
The World Map Generator is fun tool to play around with various map projections thus easily allowing to grasp the pitfalls and potential of maps.
Why replicability matters: The Economist on Unreliable Research.
International economics
I like the WTO's (2012) A Practical Guide to Trade Policy Analysis, and the second volume WTO's (2016) An Advanced Guide to Trade Policy Analysis:
Programming etc.:
The Latex Table Editor makes it super easy to compile beautifully structured tables in Latex.
An alternative, more powerful table editor for latex: Tinytable.
A decent set of cheat sheets for Stata.
If you reach Stata's limits (and don't want to use R), you can easily export your Stata graph to PDF, use Nitro's PDF to PPT converter to transform it into a PowerPoint graph, which then can be easily edited as desired.
These operators help to use Google more efficently, i.e. exclude words or the like.
Style
How to do nice, informative graphics in Stata is explained in Mitchell's (2012) A Visual Guide to Stata Graphics. Schwabisch's (2014) An Economist's Guide to Visualizing Data as well as Tufte's (1995) quite amazing The Visual Display of Quantiative Information help with inspiration.
I found Thomson's (2011) A Guide for the Young Economist helpful. Information on virtually everything a PhD student in economics has questions on. Neugeboren and Jacobsen's (2005) Writing Economics is a neat reader, too.
Organisational:
WorkFlowy is a super smooth documentation tool, which turns out particularly helpful in collaborations (e.g. because it allows to earmark tasks or because it is a good basis for when you call your co-authors).
My favourite tool to keep track of my bibliography is Mendeley (but of course there are many alternatives). Anyway, if you want to read in your Word-based bibliography into BibTex, then Wizfolio comes in handy.
Stata