Deep Glow gives you the best looking glow right out of the box, even whilst working in a non-linear color space. It features intuitive compositing controls to assist in refining your glow results. Deep Glow is also GPU accelerated for speed and features handy downsampling and quality controls which can also be leveraged to achieve unique results (grainy or stylised glows).
 
Core Features:

    Physically accurate inverse square based falloff
    GPU acceleration
    8, 16 and 32bpc compatible
    HDR thresholding
    Thresholding Smoothness (reduces temporal flicker)
    Gamma correction (linear results even when working in non-linear colorspace)
    Compositing controls

Home page - https://aescripts.com/deep-glow/