Answer: Flutter: Create a timeline UI

I like Osama's answer too but here's my quick custom implementation. It uses a CustomPainter to draw the lines.

import 'package:flutter/material.dart'
class Timeline extends StatelessWidget {
  const Timeline({
    Key? key,
    required this.children,
    this.indicators,
    this.isLeftAligned = true,
    this.itemGap = 12.0,
    this.gutterSpacing = 4.0,
    this.padding = const EdgeInsets.all(8),
    this.controller,
    this.lineColor = Colors.grey,