- SVG 1.1 - the current standard
- SVG 2.0 (draft) - the next version
- W3C's SVG Page - home page of the group in charge of the standards
- MDN - Mozilla's SVG reference, nicely hyperlinks and with lots of examples.
- Wikipedia's SVG page - nice history and overview
- Inkscape - open source, but no Mac support
- Adobe Illustrator - powerful, but expensive, and no Linux support
- Vecta.io - browser-based, looks promising
- Sketch - commerical though not too expensive, but Mac-only
- AutoTracer - convert from raster (JPEG, PNG, GIF) to SVG
- svg2raster - convert from SVG to PNG
- favicon - convert from SVG to ico. Works great for using an SVG emoji as a favicon.
- iconizr - convert a collection of SVGs into a CSS icon kit
- font-blast - convert an SVG font into individual SVGs
- svg2android - convert to Android's VectorDrawable XML format
- PDF to SVG - convert each page of a PDF to an SVG
- svg-icon - includes icons from over 30 different sources.
- GlyphSearch - similar to svg-icon though only 9 sources, but has a nice search function
- The Noun Project - commercial, but boy do they have a lot of icons
- icon section on awesome-design
LogoSear.ch is a great search engine just for logos, with the list of sources and alternatives.
- D3.js - generate/manipulate SVGs from JavaScript. A great way to do graphs and diagrams: be sure to check out the gallery
- SnapSVG - animate your SVGs with JavaScript
- SVG-Edit - open-source JavaScript editor to embed in your app or website
- SVG-Morpheus - morph from one icon to another
- svgcleaner cli | GUI - compresses the most, and much faster than the others
- SVGO cli | web - written in JavaScript and plugs into a whole bunch of different build tools.
- scour - Python
- nano
- 94.6% basic support - inside an embed or object element
- 94.5% HTML img
- 94.5% css background
- 94.5% inline in HTML5
- 93.9% filters
- 88.4% effects for HTML
- 88.0% SMIL animation - all except IE
- 18.4% favicons
- css-tricks' Compendium of SVG Information - this site also a ton of great articles on using SVGs
- Willian Justen's awesome-svg - not as curated as my awesome list, but still a ton a interesting links