EP127: 20 Popular Open Source Projects Started or Supported By Big Companies

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This week’s system design refresher:

• HTTP 1 Vs HTTP 2 Vs HTTP 3! (Youtube video)

• 20 Popular Open Source Projects Started or Supported By Big Companies

• A Cheatsheet for UML Class Diagrams

• Top 6 Tools to Turn Code into Beautiful Diagrams

• 5 HTTP Status Codes That Should Never Have Been Created

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HTTP 1 Vs HTTP 2 Vs HTTP 3!

20 Popular Open Source Projects Started or Supported By Big Companies

1. Google
   - Kubernetes
   - TensorFlow
   - Go
   - Angular

2. Meta
   - React
   - PyTorch
   - GraphQL
   - Cassandra

3. Microsoft
   - VSCode
   - TypeScript
   - Playwright

4. Netflix
   - Chaos Monkey
   - Hystrix
   - Zuul

5. LinkedIn
   - Kafka
   - Samza
   - Pinot

6. RedHat
   - Ansible
   - OpenShift
   - Ceph Storage

Over to you: Which other project would you add to the list?

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A Cheatsheet for UML Class Diagrams

UML is a standard way to visualize the design of your system and class diagrams are used across the industry.

They consist of:

1. Class
   Acts as the blueprint that defines the properties and behavior of an object.
   

2. Attributes
   Attributes in a UML class diagram represent the data fields of the class.
   

3. Methods
   Methods in a UML class diagram represent the behavior that a class can perform.
   

4. Interfaces
   Defines a contract for classes that implement it. Includes a set of methods that the implementing classes must provide.
   

5. Enumeration
   A special data type that defines a set of named values such as product category or months in a year.
   

6. Relationships
   Determines how one class is related to another. Some common relationships are as follows:
   - Association
   - Aggregation
   - Composition
   - Inheritance
   - Implementation
   

Over to you: What other building blocks have you seen in UML class diagrams?

Top 6 Tools to Turn Code into Beautiful Diagrams

• Diagrams

• Go Diagrams

• Mermaid

• PlantUML

• ASCII diagrams

• Markmap

Did we miss anything? What's your favorite?

5 HTTP Status Codes That Should Never Have Been Created

• 451 Unavailable for Legal Reasons: Access denied due to legal issues.

• 218 This is Fine: Inspired by the meme, bypasses server error overrides.

• 420 Enhance Your Calm: Twitter’s old code for exceeding rate limits. Now changed to 429.

• 530 Site Frozen: Used by Pantheon for locked sites, often unpaid bills.

• 418 I'm a Teapot: A classic April Fool's joke indicating a server's limitations.

Over to you: Have you come across any other weird HTTP Status Codes?

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