I am planning to write a technical specification document / functional specification for my personal project. Can anybody suggest any useful links / tools / templates that can help me?
I am mainly looking for tools (preferably freeware).
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There are many free templates available, search on technical specification template.
docstoc has a technical specification template that looks clean and professional.
Unfortunately, I don't know of a tool that will do it automatically. When done right, doing it by hand, while cumbersome, can be really beneficial.