What is a good free cryptiminer>

Like the title says, is there any good free cryptominers?

And are these effective?

is bitcoins worth your time?

I use NiceHash Miner 2.
Personally, I don't think it's worth it. You should use a calculator and checkout the current market worth for bitcoin, and find out what's most profitable for you.
Everyone has their own opinions if it's worth your time, so you'll have to make your own opinion if it's worth it.

You can checkout the market for crypto currency on the website "coinmarketcap"
Every currency has it's own pro's and cons, it's just finding the best one to suit you and your needs.

it's own pro's and cons, it's just finding the best one to suit you and your needs

I'm in.
I want to creat a forum. Or a blog.
That's all. And thanks for hosting this giveaway.