ProShot is a camera app for Android that costs $2.99 and has zero in app purchases.
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Pro Supports multiple aspect ratios
ProShot has options for 4:3, 16:9 and 1:1 aspect ratios allowing the shooter to choose what best suits their intended shape. It also has support for custom aspect ratios, so 3:2, 21:9, 50:3, and more are all possible.
Pro Full manual control in Photo, Timelapse, and Video modes
On devices with Camera2 API support (currently LG G4, Nexus 5, Nexus 6, Samsung Galaxy S6/S6 Edge), ProShot offers full manual control over ISO, shutter, white balance, and focus, in any mode, even during video recording.
Pro RAW and other format support
ProShot can shoot in RAW, RAW + JPEG and JPEG formats, giving ample options for one to shoot in.
Con Requires Android 5.1
ProShot requires that the Android OS is on version 5.1 or higher in order to install and work. Considering there is only a developer preview for this version to date, it basically can not yet be installed. Even when 5.1 comes out there will not be many devices using it.
Developer's note: there are many camera bugs in 5.0 that are only fixed in 5.1. Support for 5.0 may come in the near future, with some features locked until the upgrade to 5.1.