Some good resources for web game development
Websites to compress images https://tinypng.com/ https://www.websiteplanet.com/webtools/imagecompressor/ Create spritesheets online for HTML5 games https://www.leshylabs.com/apps/sstool/ Create Android assets online https://romannurik.github.io/AndroidAssetStudio https://easyappicon.com/ Royalty free images / vectors https://pixabay.com/ https://www.pexels.com/ https://publicdomainvectors.org/ https://openclipart.org https://purepng.com https://www.iconspng.com/ Free custom icons https://www.iconsdb.com/ Online APK Analyzer https://www.sisik.eu/apk-tool Free Icons for Commercial Use https://iconarchive.com/ http://www.iconsdb.com Generate CSS Sprites https://instantsprite.com/ Responsive CSS Sprite Maker https://responsive-css.spritegen.com/ Free Sound https://www.freesound.org