pdr (personal data recorder) and pdx (personal data expert) are applications that collect and evaluate mostly numeric personal data. The intended use case is for logging individual medical data (blood sugar, blood pressure, body temperature, weight, heart rate, and medications), but they can also be used for technical, sports, fitness, weather, environmental, or financial data. They work on a continuous flow of numbers in time that you want to monitor. Every data item can also be commented by text. pdr can use Twitter and email accounts for data input, which makes mobile phones usable for data input. It is one of the few free applications for diabetics.
Diet Monger Ass Kicker (DMAK) helps the user design diets according to the user's specifications. The EuGTK version of DMAK, unlike the wxEuphoria version, does not require a *.so file, which was a problem for some people. It uses USDA data, and does sorting and filtering and calculations, and has Google search features, and gives you virtually all knowledge known to man about 7500 foods and 140 nutrients. It uses *.req files, which you can create or edit, and which determine the nutrient requirements. It remembers your settings. It has file features and clipboard features. Documentation is thorough. You can upgrade the data every time the USDA updates their data.
iKeepAtive is a fitness scheduling app, designed primarily to help users schedule their workouts and integrate with the system calendar to make sure you do them. The application also has Calories tracking, diet tracking, and daily portrait tracking. The user interface is presented in a simple, 5-view design. It also includes BMI, BMR, and TDEE calculators.
Foods and Moods is an application that tracks what you eat and how you feel. It is aimed primarily towards people trying to track which foods may trigger their digestive problems. It does this by keeping two logs: a log of the foods you eat and a log of your moods. This provides you with a searchable history using keywords or "tags", so you may see for yourself if there is any relationship between the two. It doesn't attempt to do any medical or nutritional analysis.
wger Workout Manager is a Web application that can manage your workouts, group them into schedules (A>B>C), and export them as PDFs or iCal files. It helps you keep a log of the weights lifted in the different exercises as well as your own body weight and can also create and manage your diet plans.