independent

a neutral or uncommitted person (especially in politics)

a writer or artist who sells services to different employers without a long-term contract with any of them

free from external control and constraint; "an independent mind"; "a series of independent judgments"; "fiercely independent individualism"

(of political bodies) not controlled by outside forces; "an autonomous judiciary"; "a sovereign state"

(of a clause) capable of standing syntactically alone as a complete sentence; "the main (or independent) clause in a complex sentence has at least a subject and a verb"

not controlled by a party or interest group