send+more=money the classic
SATURN+URANUS+NEPTUNE+PLUTO=PLANETS hard one
math+math=habit solvable by matrix
COMPLEX+LAPLACE=CALCULUS tip: rule M+P=10
This tool does not solve the puzzle unlike the link below. But it can provide clues on how to come closer to a solution.
generator BETA BETA BETA
This generates a puzzle with given words by brute force. More than 6 different letters in the terms of the sum will be too slow. To be improved.
The sum letters can be chosen from the generated content. Uniqueness not guaranteed, but indicated.
Can also be used to solve addition, subtraction and multiplication alphametic puzzles with not too many different letters in the "terms" section.
MAD MAN ===* ASYLUM
in the above puzzle MAD MAN is the "terms" section (or summands; factors in this case); ASYLUM is the "sum", or product in this case.
Truman Collin's Alphametics page
Uni Bielefeld Alphametics page
Mike Keith's Alphametics page
Addition Alphametics solver
Ultimate Alphametics solver