bsTimeline

HTML

<link rel="stylesheet" href="https://netdna.bootstrapcdn.com/bootstrap/3.0.3/css/bootstrap.min.css">
<div class="container">
    <div class="timelineBar"></div>
    <div class="timelineDot"></div>
    <div class="row">
        <div class="col-sm-6">
        </div>
        <div class="col-sm-6">
            <div class="shadowBox">right</div>
        </div>
    </div>
    <div class="row">
        <div class="col-sm-6">
            <div class="shadowBox">left</div>
        </div>
        <div class="col-sm-6">
        </div>
    </div>
    <div class="row">
        <div class="col-sm-6">
        </div>
        <div class="col-sm-6">
            <div class="shadowBox">right</div>
        </div>
    </div>
    <div class="row">
        <div class="col-sm-6">
            <div class="shadowBox">left</div>
        </div>
        <div class="col-sm-6">
        </div>
    </div>
</div>

CSS

@import url('https://netdna.bootstrapcdn.com/bootstrap/3.0.3/css/bootstrap.min.css');
.timelineBar {
    width: 2px;
    background-color: #BDBDBD;
    display: inline-block;
    position: absolute;
    height: 100%;
    left: 50%;
    margin-left: 10px;
    margin-right: 10px;
}
.shadowBox {
    box-shadow: rgba(0, 0, 0, 0.796875) 0px 0px 2px;
    -webkit-box-shadow: rgba(0, 0, 0, 0.796875) 0px 0px 2px;
    border:2px solid white;
    border-radius: 10px;
    margin: 10px;
    background-color: #FFFFFF;
}
.timelineDot{
    width: 10px;
    height: 10px;
    background-color: #BDBDBD;
    opacity: 1;
    display: inline-block;
    position: absolute;
    left: 50%;
    top: 15px;
    margin-left: 6px;
    border-radius: 10px;
}