CREATE TABLE table_204_870 (id DECIMAL, "product" TEXT, "main functionality" TEXT, "input format" TEXT, "output format" TEXT, "platform" TEXT, "license and cost" TEXT, "notes" TEXT)

what is the number of open source products available ?
SELECT COUNT("platform") FROM table_204_870 WHERE "license and cost" = 'open source'
SELECT COUNT("platform") FROM "table_204_870" WHERE "license and cost" = 'open source'