Which now super popular software started off with 1 as its logo?

They got into trademark disputes etc and eventually changed the name to what it is now.

Cracked by: Raghuvansh, Sumanth Patlolla, Anjul, Manish Achuth, Rogi, Debasish, shrey, jins, Jean Valjean, shrik, Riyaz Usman, aditthya, Antariksh Bothale, vinayaknp, Sandor, Dibyo, Ananth, sandeep bhat, Siddarth Pai, dineshk, KK, Logik, Mo, jowens, S M MUNEER ALI, Rahul Rajeev, chaitanya, piezocake, Atul Mathew, raklodramA, rohanquizzer, Shwetha Maiya and Moju21