Cassowary Fractions allows users to explore half and quarter in context.
Cassowary fractions
Cassowary sanctuary

Number Line helps users to record how they solve addition and subtraction problems using a number line.
Number Line

Number Trains asks users to place numbers in order to form 'trains'.
Number trains: numbers 1 to 10
Number trains: numbers 1 to 20
Number trains: numbers 30 to 50
Number trains: numbers 90 to 120
Number trains: skip counting
Number trains

Scale Matters helps users explore numberlines with a variety of scales.
Scale matters: ones

The Number Partner helps users find the pairs of numbers that add together to make numbers from 10 to 30.
The number partner

NLVM: Fraction manipulatives
Fraction pieces
Fractions: parts of a whole