Today I came across a website that has a database of transcribed Indentured Servant Registers of Bristol, Middlesex and London. Dates 1654-1759
Some of the fields include: name, gender, length of indenture, occupation, destination, ship, parent's name, spouse's name, city of origin, agent's name, etc.
Search the Registers of Servants Sent to Foreign Plantations here.
I then found a publication of indentured servants for Philadelphia at Internet Archive:
Record of indentures of individuals bound out as apprentices, servants,etc., and of German and other redemptioners in the office of the Mayor of thecity of Philadelphia, October 3, 1771, to October 5, 1773