Engineering
- Google SRE Book
- 12 Factor Applications
- Grafana (docs)
- Ansible (docs)
- Prometheus (docs, blog)
- Docker docs
- Kubernetes developer docs
- How to Design Programs (MIT Press)
- Apache Kafka (quick start docs)
- Algorithms & Data Structures (Python version)
- Data Structures (Python School)
- Code Challenges (docs)
- Project Euler (docs)
- Codewars (docs)
Management
AWS
Golang
- Go Programming Documentation
- GoDoc Documentation
Python
- Python Wheels
- Python Tutor (Visual Debugger)
- WTForms (docs)
- Flask SQL Alchemy (docs)
- Django (docs)
- Dive Into Python3 (book online)
- Python3 Module of the Week (book online)
- Celery (docs)
- PyBites (code challenges)
Databases
- PostgreSQL (docs)
- MongoDB (Python docs)
- Redis (docs)
Linux
- RedHat Product Documentation
- Ubuntu Documentation
GIS
- GIS Lounge
- GIS Lectures and Labs for Free
- ArcGIS Online