Free knitting tools: yarn substitutes, raglan planner, cast-on and yarn swap calculators, increase evenly, pick up stitches, needle sizes and yarn weights.
Raglan planner: Any raglan, top-down or bottom-up: where every stitch goes, and a diagram.
Yarn substitutes: Pick your pattern's yarn: see what can stand in for it, and how many balls of each.
My Stash: Every yarn you own, counted: what's left, what it's worth, and what you can knit with it.
Skeins for a yarn swap: Swapping yarns? How many balls of yours to buy, with a safety margin.
Cast-on from gauge: From a width, a pattern's cast-on or your body: how many stitches to cast on, rounded to fit your rib.
Increase & decrease evenly: “Increase 12 stitches evenly” — turned into exactly what to knit or crochet.
Pick up stitches: How many stitches to pick up along an edge, and a rhythm to do it.
Yarn weights: DK, worsted, 8 ply, weight 3 — what a yarn weight means, and what yours is.
Needle & hook sizes: Metric, US, old UK and Japanese needle sizes, hook letters and steel hooks.