A few strong starting points across Yantrakosha.
FreeAudioKit
FreeBMIKit
FreeBrandKit
FreeBudgetKit
14 free online tools in this category. All free, no sign-up required.
14 tools
Online Chart & Graph Maker
Developer Tools
Free Online Clipboard Manager & Snippet Organizer
Code Generator & Developer Snippets
Image & File Compressor
Developer Utilities Toolkit
IP Address Lookup & Network Tools
URL Shortener & Link Manager
Markdown Editor & Converter