Client Server Architecture Design Tools: SmartDraw & Draw.io

Here are the tools to use to document Client-Server architecture/design:

SmartDraw:

It allows us to draw and document various types of software design documents such as

1. UML diagrams
2. Data flow diagrams
3. Entity relationship diagram and various other software design diagrams.

Cost:

It is free for first 30 days. (We can sign up using any email address and can use 30 days free trial period) It allows us to creates unlimited documents in its trial period

Draw.io

Draw.io is helpful tool to create a flow chart or any diagram with plenty of shapes to correctly visualize your infrastructure. There are pre-defined software design templates to get started in documenting the software diagrams.

Cost:

It is completely free to use. It is an open source, online, desktop and container deployable diagramming software

These both tools are easy to use. Other than these tools, if require to document client-server architecture model in detail, the word document is the option to document the model in detail.

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Regarding LucidChart

LucidChart isn't a good choice for these diagrams due to it's picky interface - it's hard to do fine details, let alone click the text box you want to edit, in LucidChart. The above options are better choices for large diagrams.