The most commonly known tools are obviously kunais and shurikens. All shinobis tend to use them.
A kunai is actually part of a gardening kit, but it's a cheap weapon that can be utilized by ninjas and can be very deadly if used correctly. Kunais are used at any range. They can be a replacement for a "Tantõ" at short range, as a lot of ninjas tend to use them as a melee weapon. On the other hand, this tool can also be used as a weapon at mid/long range. When used in thise range, the opponent throws them, possibly to deflect other kunais or attack an opponent, but shinobi also add other tools to them. Tools such as; explosive tags, flashbangs, smokebombs and more.
Shurikens are simply ninja stars, with four points (most of the time) that are thrown at the enemy. These are sometimes multiplied by a shuriken clone technique, to have hundreds of these weapons assail the enemy.
The bigger brother of the Shuriken is called the Windmill Shuriken. this weapon consists of 4 blades, attached to one another, forming a shuriken shaped weapon. As a kunai, this weapon can be used as a melee and distance weapon.
The fourth, and last most commonly used weapon is a Tantõ. Members of root are almost always seen using them. These are short blades, of which the tip is broken off. These are close range weapons only.