Development tools for Zephyr on STM32Workbench for Zephyr: VS Code extension to set up, build, flash and debug Zephyr applications on STM32.Devicetree manager: browse, edit and visualize Zephyr devicetree, STM32CubeMX-like for Zephyr.
TIM_Cmd, TIM_TimeBaseInit and TIM_GetCounter are ALL defined in stm32f10x_tim.h so I don't know what eclipse is complaining about. Maybe again one of those eclipse oddities? See screenshot attached.