A few strong starting points across Yantrakosha.
FreeAudioKit
FreeBMIKit
FreeBrandKit
FreeBudgetKit
12 free online tools in this category. All free, no sign-up required.
12 tools
Free Poll & Survey Creator
Productivity
Printable Calendar & Date Calculator
CSV Editor & Data Converter
PDF, CSV, Excel & Archive Tools
Digital Journal & Mood Tracker
Free Name Generator Suite
Free Online Markdown Slide Maker
Pomodoro Timer, Todo List, Habit Tracker & Notes