Atomic swaps are becoming more popular and we may see greater volume soon on these exchanges with all the crypto regulations forced on centralized exchanges.

You can check https://www.xlitewallet.com/ It supports BTC, DASH, LTC, DOGE, SYS, BLOCK, and PIVX. It claims to have no centralized servers and secured by decentralized service nodes. The design also looks fine based on the images from the site.