In India, several reputable Demat/Investment account service providers offer a range of features to cater to diverse investment needs. Here are some of the top providers:

Zerodha
A leading discount broker known for its user-friendly platform and low brokerage fees. Zerodha offers free equity delivery trades and charges a flat ₹20 or 0.03% (whichever is lower) per executed order for intraday and F&O trades. Zerodha Open Account 

Upstox
Offers competitive brokerage rates with a robust trading platform. Upstox charges ₹20 per order or 2.5% (whichever is lower) for intraday and F&O trades, with zero brokerage on equity delivery. Upstox Open Account

Angel One (formerly Angel Broking)
Provides a comprehensive range of investment options with a strong advisory support system. Angel One offers zero brokerage on equity delivery and charges ₹20 per order for intraday and F&O trades. Angel One Open Account

ICICI Direct
A full-service broker offering a 3-in-1 account integrating banking, trading, and Demat services. ICICI Direct provides various brokerage plans, including a fixed monthly fee plan and a per-trade plan, catering to different trading frequencies. ICICI Direct Open Account

HDFC Securities
Offers a 3-in-1 account with seamless integration between banking and trading services. HDFC Securities charges a percentage-based brokerage fee, with rates varying based on the trading segment and volume. HDFC Securities Open Account