Torva / Virtus / Phernix.
However, these three (classed Melee, Mage and Range respectively) sets are the most expensive sets of armour. More affordable but strong armours include (but are not limited to) Barrows, Bandos, Batwing robes, Black D'hide, etc.
probably chaotic maul or vestas longsword
Super strong weapon poison is the strongest (P++). It is made with nightshade and poison ivy in a vial of cocnut milk using the herblore skill.
g2h stands for "Gravite 2-handed sword" This is the strongest hitting melee weapon in free to play Runescape. It is a reward from the Dungeoneering skill.
Probably the Rune battleaxe, though the Warhammer is slightly stronger against plate armor.
The Strongest Weapon is KAMEHAMEHA WAVE its an unrealese weapon XD believe it 1 hit.
Dragon arrows are the strongest arrows in runescape.
t10000564
Godswords.
the supergun.
advice: get a weapon
A Weapon
There is no weapon stash in Runescape. If you need a sword or armor, you can either buy it at the Grand Exchange located at Varrok, or you can make your own.