Giving $2 a month helps more the network that you would think.
Index of SoFurry fictions, allows fulltext searches. Tech stuff: ElasticSearch.
Mobile viewer for e621 with horizontal scrolling and image lazy-loading. Tech stuff: official e621 API.
Cast 4K/FHD furry images to your TV!
e621 queries analyzer: trends with graphics. Tech stuff: ElasticSearch.