Crossword Puzzle Improperly altered

Clue: Improperly altered

Like software that can be freely used and altered (OPENSOURCE with 10 letters)
Altered tones? (ONSET with 5 letters)
Altered mortgage, briefly (REFI with 4 letters)
Altered basaltic rock (GREENSTONE with 10 letters)
1977 David Bowie album whose cover was altered for his 2013 album "The Next Day" (HEROES with 6 letters)
ALTERED altered thrice (REDEALTRELATEDTREADLE with 21 letters)
Altered spot? (OPTS with 4 letters)
Altered loan, briefly (REFI with 4 letters)
Altered, in a way (e.g. LENGTHENED with 10 letters)
Not altered (INTACT with 6 letters)