Question: Which Runs on POSIX style systems has a Developer of Andéor?
SQL: SELECT "Runs on POSIX style systems ?" FROM "2-18913138-1" WHERE "Developer" = 'Andéor';

Question: Which User Interface Language(s) has Runs on POSIX style systems of No and Sescoi?
SQL: SELECT "User Interface Language(s)" FROM "2-18913138-1" WHERE "Runs on POSIX style systems ?" = 'No' AND "Developer" = 'Sescoi';