I use a lot of different resources when creating various technology solutions. See below for the most important ones. I've grouped them into sections based off of the undergrad specializations in the ITM program.
Also check out my blog: eric.tendian.io
Systems Security:
SSL deployment best practices https://www.ssllabs.com/downloads/SSL_TLS_Deployment_Best_Practices_1.3.pdf
DDoS prevention http://blog.cloudflare.com/ddos-prevention-protecting-the-origin
Open Web Application Security Project (OWASP) Cheat Sheets https://www.owasp.org/index.php/Cheat_Sheets
SecurityWeek Infosec News http://www.securityweek.com/
/r/netsec - Information Security Discussion http://www.reddit.com/r/netsec
Data Management:
Hash generator (for when you need to reset a password directly inside the database) http://www.insidepro.com/hashes.php
The Log: what every engineer should know http://engineering.linkedin.com/distributed-systems/log-what-every-software-engineer-should-know-about-real-time-datas-unifying
Database test data generator http://www.databasetestdata.com/
NoSQL data modeling techniques http://highlyscalable.wordpress.com/2012/03/01/nosql-data-modeling-techniques/
SQL vs. NoSQL, which one is better? (hint: it depends) http://slashdot.org/topic/bi/sql-vs-nosql-which-is-better/
Web Design and Application Development:
See what other companies are using http://leanstack.io/
Save money by comparing AWS instances http://www.ec2instances.info/
REST API best practices http://www.vinaysahni.com/best-practices-for-a-pragmatic-restful-api
How to become a better developer http://heybigname.com/2013/01/21/how-to-become-a-better-developer-straight-talk
Dev Tools list for Windows http://www.hanselman.com/blog/ScottHanselmans2014UltimateDeveloperAndPowerUsersToolListForWindows.aspx
Web Design resources from A List Apart (tons of stuff here) http://alistapart.com/article/ALAprimer
Long list of Bootstrap resources http://www.bootstraphero.com/the-big-badass-list-of-twitter-bootstrap-resources
UI Design tips http://goodui.org/
IT Entreprenuership and Management:
Startup=Growth http://www.paulgraham.com/growth.html (also check out Paul Graham's other essays)
Hacker News https://news.ycombinator.com/ (lots of entreprenuership and code posts here)
Advice for ambitious 19 year-olds http://blog.samaltman.com/advice-for-ambitious-19-year-olds
5 things I've learned in 5 years of running a SaaS http://mir.aculo.us/2013/11/27/5-things-ive-learned-in-5-years-of-running-a-saas/
Interview questions for your future employers http://www.runtime-era.com/2013/03/my-interview-questions-for-potential.html
Startup or big enterprise? https://al3x.net/2013/05/23/letter-to-a-young-programmer.html
Software Development:
Put your code on https://github.com/ (also check out BitBucket)
Working remotely: http://markcampbell.me/tutorial/2013/05/23/how-to-work-remotely.html
Picking tech for your startup http://blog.opbeat.com/posts/picking-tech-for-your-startup/
Coding interview tips https://www.interviewcake.com/tips-and-tricks
Help out some open source projects (great to put on a resume) http://www.codetriage.com/
Clean Code Cheat Sheet http://www.planetgeek.ch/wp-content/uploads/2013/06/Clean-Code-V2.pdf
System Administration:
Sysadmin screencasts http://sysadmincasts.com/
Explain Linux commands http://explainshell.com/
Linux monitoring tools http://aarvik.dk/four-linux-server-monitoring-and-management-tools/
AWS things to know http://highscalability.com/blog/2013/11/5/10-things-you-should-know-about-aws.html
AWS tips http://wblinks.com/notes/aws-tips-i-wish-id-known-before-i-started/
Networking and Communications:
Use OpenDNS for your computer's DNS http://www.opendns.com/
Use Cloudflare for your website's DNS https://www.cloudflare.com/overview
Twilio provides cloud communications https://www.twilio.com/
Optimizing data transfer for mobile devices http://highscalability.com/blog/2013/9/18/if-youre-programming-a-cell-phone-like-a-server-youre-doing.html
Also check out all these IT ebooks: ftp://ftp.fixme.ch/free_for_all/