Text Processing
Reverse characters, words, or lines in text
text-reverserConverter
Convert standard cron expressions to Quartz cron format
cron-quartz-converterGenerator
Generate tournament bracket with team names and match structure
bracket-generatorHealth
Calculate Basal Metabolic Rate (BMR) - calories burned at complete rest
bmr-calculatorHealth
Calculate Body Adiposity Index (BAI) - estimates body fat percentage from hip circumference and height
body-adiposity-calculatorGames
Generate simple crossword puzzles from custom words and clues
crossword-generatorHealth
Calculate optimal wake-up and bedtimes based on 90-minute sleep cycles
sleep-cycle-calculatorHealth
Calculate Total Daily Energy Expenditure (TDEE) - total calories burned per day
tdee-calculatorDate & Time
Calculate business days excluding weekends
business-day-calculatorDate & Time
Convert dates to and from RFC 2822 format
rfc-2822-converterMath & Numbers
Calculate Taylor series expansion for common functions
taylor-seriesDesign
Generate CSS filter properties
css-filter-generator