Immutables allows you to embrace immutablity to tackle complexity and concurrency challenges. To get the benefits of immutability in Java, there's an annotation processor to easily create simple and consistent value objects. You can think of it as Guava's Immutable Collections but for regular objects. It includes support for JSON marshaling, MongoDB repositories, and JAX-RS.
YAACC is an Android UPnP controller. It allows you to discover, use, and control UPnP devices on your network to stream media files. Since it's a subset of UPnP, it is also capable of communicating with DLNA devices. It is possible to start a UPnP server on your device in order to play media from your device on any UPnP renderer in your network. If you start the YAACC UPnP renderer service, you are able to control your device by another UPnP controller in the network. This is quite useful for Android HDMI sticks plugged into your TV. If you install YAACC on them and start the UPnP renderer service, you are able to stream media file to it using YAACC on your smartphone or tablet.