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Most of them are. I have downloaded plenty, and all have worked like they were supposed to. But remember that all mods are made by users, and the Minecraft developers can never guarantee that they are safe.
Get all the mods!
Minecraft Forge lists you all mods in minecraft and Forge
All minecraft mods are free. If you find mods that cost money, don't buy them. It is either a scam, waist of money, or both.
To get mod packs you must go to the forums for minecraft. There should be a forum that is for mods and you can find all the mods there. The first mod that you will need for minecraft would be the ModLoader, which is used to load all the mods that you will acquire.